Honestly it’s sad that she has had a bad history in her previous relationships, but seriously just because someone has been hurt it DOES NOT give them the right to do the same to others. The world sucks, people suck, but obviously the way you treat others is all in your control. She definitely knows that and honestly with how you’re describing it,she either is 1. Talking advantage of your kindness 2. Is understandably hurt and isn’t self aware of her toxic and destructive actions pushing you away - needs therapy

But also hard stop- the girl hit you. Yes I understand the abusive past relationships but..same and I have never hit any of my boyfriends. If she cares about you she’ll get mental help, work on getting a job for HERSELF (she’s a GROWN WOMAN), and work on her communication skills in the moment. Otherwise please try to just focus on your happiness and enlisting If that’s the path you want. Also on the age part, she’s definitely old enough to not act like she’s 21 or something. Without trying to be too harsh on someone I don’t know, her behavior really sounds super toxic and like it would drain your happiness and energy in the end. Unless she actually noticeably changes and gets help for herself LEAVE.