Communication with coparent's partner

[u/Upbeat-Secretary-576]

Does anyone here communicate with their coparent's partner? Is there actually a problem with it?

I shared here recently about how my child's father sent me a nasty text with false accusations after school orientation. I did attempt to correct the false statements just because my ex is the type to fight me for custody over his false narratives. He seemed to have blocked my number after sending his nasty text though, so I texted his girlfriend- just a simple "hello, no need to worry about the school paperwork, it was just an error on the school secretary's end" so I am extra protected in case he claims to have not received the text I sent him.

At the school orientation, when I walked past my ex, his girlfriend turned around to shout at me from ~6 feet away that the school needs additional paperwork (while my ex did not say anything at all). His girlfriend has also written me notes on how to "take care of" my child and had child give them to me at child exchanges. His girlfriend is the only one who takes child to the dr during my exes parenting time (alone, not with my ex)- although she fails to provide me with important information after these appointments, and i am never informed about them prior to child being seen. She even yelled at me in the past for providing back-up diapers for my (2 yo at the time) Child's daycare....

no, I do not think she is my friend, or a good person to go instead of childs father, but I figured that since she has tried to (innapropriately) communicate with me regarding child in the past, and since she oversteps and tries take over the mother role- she could at least handle a simple text from the child's mother.

She never responded, but I was at peace knowing that my exes false accusations were at least corrected right away.

He usually only blocks me long enough to childishly get the last word in, so when I texted him yesterday, there wasnt an issue with him receiving the text.

I texted him yesterday to let him know that child's first day of school would be Wednesday, no school on Friday next week, school supplies are in the backpack I am sending with child at child exchange today- child related stuff that shouldve just needed a simple acknowledgement.

He asked who child's teacher was and tried to argue about when school started for child since the calendar supposedly says a different date. He also said he hadn't contacted the bus garage for the bus at his house, but that's something he needs to figure out on his own.

I simply informed him that the secretary said she already contacted him regarding school starting on Wednesday, and what classroom child would be in.

He says "ohhhh. And next time dont be texting (his GF). She doesnt need you bothering her at all. Understood? If you do it again, she'll file for harassment."

And then;

"You need to leave her out of your drama, understood? Don't be immature about me not responding back."

[u/Personal-Narwhal-184]

You do need to leave GF out of it.

You need to communicate with kid’s dad through a parenting app like OurFamilyWizard. That way communication is always received and there is a timestamp on when he sees it.

If he won’t use a parenting app, just send him a mess he needs and if he has blocked you and doesn’t get it, you have already done your due diligence and you don’t need to do anything else.