I'm sorry you're struggling in this unpredictable relationship ATM. With all the 'he's and she's' in the post, it's hard to tell if this is a same sex relationship or heterosexual -would you mind sharing your gender?

I think to save your own mental health, you need to tell her nicely that you want to take a break and she should get herself stable before you and she negotiate the status of the relationship. ATM her emotions and reactions are coming from her mental illness therefore she can't even trust her own feelings...... you certainly can trust them either. It will continue to feel like a wild unpredictable roller coaster ride. You can make it clear you care for her welfare, but you need to take care of yourself. if I were you I wouldn't participate in Facebook or any other exchanges with her.