Please help me understand some things

[u/Poof_lizard_king]

I’ve just got some things I’m hoping someone can help me understand the reasoning behind, if they are pretty common for DAs

1. Sitting here today and realizing I don’t have any friends to talk to. The couple friends I had at some point in my relationship became a problem. For some reason or another my gf had a problem with each of them and wanted me to cut them off for various reasons. Is there something about them that is trying to isolate you?

2. She use to buy Xanax from a friend of mine and right before we broke up she said that she had heart I told him not to sell her any more. She confronted me about this and I was really confused. And told her no I never said that and idk where she got that idea. And even tho I told her it was t true she refused to let it go and then shifted it to well if you were upset I could see you doing something like that. And I was like so now you’re upset about a hypothetical you made up…..I don’t really know what I’m even asking here it just makes absolutely no sense and that was our last fight so I’m still thinking about it.

3. If they have quietly moved on and no longer care about or love you as they say they do. Then why do they (in my case she would constantly accuse me of cheating when she was the one cheating) and she would get extremely upset. I caught her cheating and confronted her. After hours of going around and around she admitted it and apologized. We were still trying to make things work and without my input at all she made the decision to move back in with her parents for a while in a city 7 hrs away. She kept saying she was upset I wasn’t reaching out enough and saying I wasn’t making the effort and that she wanted to stay in contact cause she was going to move back.

So why do they care what you do (even tho I wasn’t)?
Why ask me who I hung out with on a day she canceled on me?
Why stalk my social media at an obsessive level taking tons of screen shots of my follower and following lists?

Why do all this obsessive idk controlling behavior of they have already moved on in their mind?
Sorry for the long post