<human>: Condense the text into a few key points

I'll try not to make this too long, however there's a lot to be said. My best friend has been incredibly manipulative our entire friendship which was expected of hormonal teenagers and I always just put up with it. All of my friends, family and significant others think she's insane. She's known to be incredibly passive aggressive through social media, "subtweets" her boyfriend's exs, and constantly engages in juvenile arguments. For example, her ex and her boyfriend's ex are now dating (weird, I know). For 6 months the two of them fought on social media just making fools of themselves. Finally she went too far, called her (the boyfriend's ex) work trying to get her fired, told her ex that she has been cheating, moved to live around the corner from her, and has spent a inexcusable amount of time trying to quote "ruin her life". None of this worked and to this day she plots a new scheme. 

My relationship with her has been challenging because she suffers from anorexia and the depression aspect of her disorder, in my mind, ends up justifying her behaviour. She gets mad at me for not putting her first, she expects me to drop everything every time she's admitted to the hospital. However, this has been going on for about 3 years. I don't undermine her situation but it interferes with my well being. Her health makes me anxious and her behaviour makes me feel like shit. 

Since no one likes her, I feel like I'm the only reliable person in her life but I really can't be there for her 100% of the time. I've tried to slowly get out of the relationship but once it gets to a certain point she's in the hospital again, accuses me of ignoring her etc.
<bot>: My best friend is batshit crazy, manipulative, and I don't want to be friends with her any more. However, she's anorexic and I feel trapped.