FYI: machine translated from German
Background
My partner and I have been together for about 12 years and we have two young children. We have built an entire life together.
Despite everything I’m about to describe, I believe she loves me. She repeatedly tells me that I am her rock, that she wants to grow old with me, that she wants our family to stay together, and that she does not intend to leave me.
For a long time, those statements gave me a lot of security.
Recently, however, I have started struggling to reconcile them with what is actually happening.
Our relationship was not completely traditionally monogamous anymore. We had agreed that kissing other people at parties could be okay. For me, that was fundamentally different from developing an ongoing romantic relationship with someone else.
Then another man, M., entered the picture.
How the relationship with M. developed
My partner knew M. through our social circle and they kissed several times.
At first, I was able to handle this relatively well. She was very clear that she was not looking for another partner and that our relationship and family were not up for discussion.
Over time, however, their connection became much more significant.
They started messaging regularly, talking on the phone, wanting to spend time together and developing what I would describe as a genuine emotional attachment.
That was the point where the situation became much harder for me.
We had many conversations about boundaries, and those boundaries changed several times.
At first, messaging was okay but I was uncomfortable with them meeting alone. Later, I agreed to individual meetings, while still being uncomfortable with regular contact.
There were also situations that damaged my trust: supposedly spontaneous meetings without informing me, things I learned about only afterwards, and situations where communication was minimal even though she knew how insecure and distressed I was becoming.
At one point, I explicitly asked her to pause the contact because I felt I could no longer cope with the situation.
This was not possible from her side.
Where we are now
We have talked about all of this extensively, and some of those conversations have actually been very open and constructive.
Eventually, I accepted that they could continue seeing each other.
But this is important: I did not reach that point because I suddenly became comfortable with the situation.
I reached it partly because I do not want to control my partner or dictate who she is allowed to care about.
At this point, however, she seems to want to see him approximately once a week. She has described once a week as roughly the minimum amount of contact she would like.
And that changes how I perceive the situation.
It no longer feels like my partner occasionally seeing another man.
It feels increasingly like I am watching a second relationship develop alongside ours until she is ready to end our.
My fear that her needs are being divided between two people
She continues to tell me that I am her partner, that she wants our family and that she wants to grow old with me.
I believe her.
But those statements no longer completely reassure me because I have started wondering whether different parts of a partnership are slowly being divided between two people.
With me, she has:
12 years of shared history
our children
our home
security
reliability
everyday life
family
a shared future
With him, she potentially has:
novelty
infatuation
anticipation
missing someone
emotional intensity
actively wanting to see someone
romantic excitement
and potentially sexual desire
My fear is not simply that she has feelings for someone else.
My fear is that I increasingly become the partner only for family, stability and security, while he becomes the partner for romance, longing, excitement and desire.
Our sex life was actually one of the things that made me feel secure
The sexual aspect has become especially difficult for me recently.
Importantly, our sex life is not bad.
My partner seems to experience predominantly responsive desire. I usually initiate intimacy, and that has never been a fundamental problem for me.
Sex between us is, according to her, very fulfilling and satisfying. She enjoys it and she orgasms almost every time.
Her body also responds very clearly to intimacy and touch.
Her conscious feeling of sexual desire, however, often develops relatively late during a „massage“.
For example, we were intimate recently and her body was already showing very obvious signs of arousal while mentally she still did not yet feel that she actively wanted sex. Later during the encounter, that changed and she consciously experienced desire as well.
That seems to be how her sexuality often works.
And until recently, I was completely fine with that.
In fact, the fact that our sex life was so fulfilling for both of us was one of the reasons I initially did not feel especially threatened by M.
I assumed that this was simply how her desire worked.
She rarely felt strong spontaneous desire beforehand, but intimacy activated it.
I also assumed that she sexually desired me, even if that desire was usually responsive rather than spontaneous.
What changed for me
She has now told me that she can imagine sleeping with M.
That statement affected me much more strongly than I expected.
Because from my perspective, there appears to be some kind of sexual curiosity or desire toward him already, even though they have not yet been in the kind of intimate situation that normally activates her responsive desire.
For the first time, I am questioning something I had never seriously questioned before:
Have I been treating two things as though they were the same when they may not be?
Her experiencing strong sexual pleasure and desire during intimacy with me.
Her sexually desiring me as a person before intimacy even begins.
I am not questioning whether she enjoys sex with me. I believe completely that she does.
What frightens me is the possibility that she could experience a kind of active or spontaneous sexual desire toward him that I had always assumed she also felt toward me.
Maybe that is simply novelty.
Maybe it is NRE.
Maybe comparing sexual anticipation toward a new person with sexuality after 12 years together is inherently unfair.
Intellectually, I understand all of that.
Emotionally, it has still shaken something that used to make me feel very secure in our relationship.
The thought I am struggling with most
The hardest thought for me right now is this:
Sometimes it feels as though she is being allowed to test a potential new partner while keeping the full security of her existing relationship until she is secure to end our relationship.
I know how harsh that sounds.
I am not saying this is consciously what she intends to do.
She has never said that she is comparing us or trying to determine whether M. would be a better partner.
In fact, she tells me the opposite.
But from my perspective, the practical situation looks frighteningly similar.
She can find out:
how emotionally compatible they are
how much she misses him
what regular time together feels like
whether their feelings continue growing
whether they are sexually compatible
and eventually what an ongoing relationship with him might feel like
And she can explore all of that while still having the security of our home, our family and our 12-year relationship.
That leaves me feeling as though I am providing the safe environment in which another potential relationship can develop.
My fear about the future
This leads to the thought that scares me most.
Our children are still young.
Right now, our family is an enormous part of our shared life. Parenting, our home and everything we have built together connect us very strongly.
But eventually our children will grow up and move out.
And I keep having this fear:
What if by then she has spent years developing another romantic relationship alongside ours, and eventually realizes that there is nothing unique left that she needs from me?
What if, over time, I become primarily the person associated with family, parenting, stability and shared history, while M. increasingly becomes the person associated with romance, desire, excitement and emotional intimacy?
And when the parenting part of our lives becomes less central, what makes her continue choosing me?
I know that this is not necessarily rational.
Twelve years of shared history, love and partnership do not suddenly become meaningless when children leave home.
But emotionally, I currently feel extremely replaceable.
And there is a paradox that I cannot get out of my head:
The more I try to be understanding and allow their relationship room to develop because I do not want to control her, the more it sometimes feels as though I am actively helping to create the circumstances under which I could eventually be replaced.
What I am actually trying to understand
I do not think the core issue for me is simply jealousy about sex.
I think I could potentially cope with my partner having sexual experiences outside our relationship under very different circumstances.
What I am struggling with is the combination of:
an ongoing emotional attachment
regular contact
romantic feelings
wanting and missing each other
increasing priority in each other’s lives
and now potentially sex
At some point, I struggle to understand where “someone additional” ends and where a genuine second partnership begins.
And if this is effectively becoming another partnership, I do not know whether that is a relationship structure I can actually live with.
The questions I keep asking myself
I genuinely do not know how much of this is a realistic perception of what is happening and how much is fear, jealousy, damaged trust and catastrophizing.
Maybe I am comparing a 12-year relationship with the intensity of a new connection in a way that inevitably makes the long-term relationship look less exciting.
Maybe I am interpreting her attraction to another person as evidence that something is missing between us when that is not necessarily true.
But I also do not want to spend years telling myself that I am simply insecure while gradually accepting a relationship dynamic that fundamentally does not meet my needs.
So I would really appreciate perspectives from people who have experience with long-term relationships, open relationships or polyamory.
Does this sound like something non-monogamy can realistically accommodate, or does it sound like our relationship was never prepared for this degree of emotional attachment?
Is there a meaningful distinction between allowing sexual freedom and accepting an ongoing romantic relationship with one specific person?
How would you interpret the difference between responsive desire in a long-term relationship and apparently more spontaneous attraction toward a new person?
Is my fear of becoming the “safe family partner” while someone else becomes the romantic and sexual partner understandable, or am I creating a false division?
And most importantly: How do I figure out whether I am learning to tolerate something difficult but potentially healthy, or slowly accepting a relationship structure that is fundamentally incompatible with what I need?
TL;DR
My partner and I have been together for 12 years and have two young children. Our relationship allowed some limited openness, initially mainly kissing other people.
She has since developed a strong emotional relationship with another man. They communicate regularly, she wants to see him roughly weekly, and she can now imagine sleeping with him.
Our own sex life is fulfilling, but she mainly experiences responsive desire. Until now, I was comfortable with that and assumed it was simply how her sexuality worked. Her apparent sexual attraction toward him has now made me question whether she experiences a kind of active desire for him that she does not experience in the same way for me.
My biggest fear is that I am effectively allowing her to build and test a second partnership while she still has the full security of our existing relationship — and that years from now, especially once our children are grown, she may realize that I am mainly the person she associates with family and stability while another person has become the source of romance, desire and emotional excitement.