I (21F) and my friend (22F) have been friends for 2 ish years now. Let's call her ava for the sake of this post and our mutual friend (22F) Noah. Disclaimer I am autistic and ADHD. Naturally I function very differently.
Both Ava and Noah are very accommodating of my condition but lately it seems like Ava forgets all about my condn when it concerns her. Ava and Noah were roommates then stopped talking to each other because if various reasons (mostly toxic med school life) I was friends with them before that but got closer to both after their fight because I pretty much became the only friend in the dorm. I never thought of myself as a replacement friend untill recently when they were become friends again and grew distant towards me especially Noah. It started right after a painful break up and I started feeling increasingly lonely. I expressed my concerns regarding the same to Ava and she kept saying I am overthinking it or I am wrong or that I'm being anxious attached. And that I was the one being distant, which I why since I wasnt allowed to talk to Ava about my break up. Ava would often be insensitive and harsh about the break up and get very defensive if I said it was hurtful, she also called me disappointing for letting the break up get in why of my studies and when I said that I was beating myself up for it too and didn't need a friend to tell me that. She again got defensive mad. She said I should stop talking to her about it since I am not satisfied with her answers and she needs to stop prioritizing other people and needs to take care of her own shit. She often teases me to the point I get extremely overstimulated and once I lost control of my reactions and yelled "Stop" she got mad saying I was displacing my anger but it wasn't true I was not angry. I got too overstimulated and reacted which I'm prone to because of autism.

The fight mentioned in the post, happened day before when I told her I'll talk to Noah about feeling lonely, she got mad and defensive said I was overthinking and it concerns her I'm exhausting her and that I am someone who displaces her anger on everyone. It was only once that I reacted from overstimulation, and to be she yells and gets mad at me everytime she is on her period or pmsing. Even for situations that don't involve me in any way. I told her she is not does need to continue to be friends with me if I am that exhausting. She said she didn't want to break the friendship off and I just have been too sad after my break up and not everyone wants to stay around someone with such negative energ, probably why noah was distancing herself. She rushed off and I got really sick later that day and have been on my bed ever since so never smoked about it further and she runs away everytime she sees me.