AITAH for feeling I need to leave a friend that keeps hurting me

ok I '20F' have a friend '21F' we've been friends since 6th grade. We became really close but she was always the cool one.The more artsy more social and had a alot of 'best friends' that included me. But we bacame more closer? Then I moved out to another country and had alot of issues, while she, here, had other best friends with whom she bonded with alot, later turned out my friend had borderline personality disorder (I just got to know it was never confirmed and it was suggested) and the 'bestfriend' she made became her special person or something, its a bpd thing. And that frienddship ended badly. Everything went spiral from there. The thing is.. I might sound insensitive but I feel she researched too much about her problem which turns out wasn't even there.. and took the traits up and embodied them. She started behaving wierd. I went through alot on my side at that time and when we met she would either talk about her stuff or just ignore me and make me feel wierded out (on sleepovers SHE would invite me to) and I'd be stuck with her siblings. I never was really comfy sharing anything too personal with her cz she told everything to her siblings and her mother but bcz we were really close friends' I sometimes had to. Eventually our mums grew closer and I felt she kept this friendship just for the family's sake(she recently told me that, right before a hangout she planned. When i said i don't wanna go anymore she said she was just joking). But well she was really old friend. I struggle making friends and rn she's the only one I can confidently call a friend.. but its getting out hand. I got into a college she really wanted to get into but couldn't and that combined with other stuff she really is struggling. She still has a bunch of good frineds who put up with her and now she's started to be unnecessarily rude. Not to me but eeveryone. It's like she uses her illness as a weapon, that's just me she really is sick but.. She'd be rude, throw bad remarks badmouth me, not agree she has problems, then be all nice and pretend nothing ever happeneed. When I call out to her, she tells me I can't put up with her when she always put up with me when I didn't even share anything or throw random tantrums. I want to help I've tried helping but there has to be a limit too you know. I'm going through so many struggles myself to the point i had to leave the uni. Should I just keep hearing her rants and rude remarks that actually hurt me and try to stay or justt leave cz my mental struggles cannot anymore? Like I said if i leave, i won't haave anyone remotely to call a friend anymore.