Gaslighting & suicidal thoughts

Ive been sort of seeing this girl(C) that I was FWBs with first got a year. We had issues as FWBs when she got my best friend(R) drunk and talking about her feelings another our other best friend(L). We all knew about the way she felt but my C was pushing it too much and caused issues between L and her partner T. T was also causing problems with R. C and I stopped talking for a bit but because she was homeless a few months later I paypalled her to make sure she had some money and she was ok. Back in December when we had been talking for a couple months she moved 700 miles away. We began dating in late February and she even came back to visit in late April. The issues I'm facing are she has been for the last month or so, causing tension and problems with her friends/coworkers and some called her manipulative, some say she was gaslighting them, a few people and her hung out on easter and she ended up scaring them, crashing her car with all her belongings in them and abandoned the car. She keeps calling them fake and cliquey. She has used the term "I wish I could fix my problems for me" after having complained because everyone at her work seemed to be turning on her. I love her but part of me doesn't want to be with her. She and I had plans for me to move there to be with her and now I'm not sure I want to but I'm scared that if I leave her I'll be terrified of her killing herself. She always talks about me being all she has and always talks a wanting to quit or to kill herself or something. I've been trying to fix my mental health because I have severe depression and anxiety as well as Bipolar, PTSD and a nicotine addiction. I've been trying to fix my mental and physical health, go to therapy but it feels like being with her while trying to better myself is like taking 2 steps forward and flung 10 steps back. I don't know what to do