I’m confused. Any advice?!

max

I fell for a girl that has a toxic boyfriend bottom line is I wanted to be with her but she couldn’t break up with her bf but she constantly told me she didn’t want him anymore and didn’t want to be with him but she couldn’t dumb him because he was constantly try to manipulate her mother and younger sister into keeping her in the relationship and she has zero power within herself she’s turning 17 and her younger sister is like 15 there both in hs and her bf is 19 im also 19 but she said she wanted to break up w him and start the new year single but I stop secretly meeting up and shit because she wouldn’t leave him because of her lack of power and just kept saying why she couldn’t bring herself to break up with him right away and I started feeling like a side piece and I didn’t even want to be her friend while she was with him because I have traumas that won’t let me see that shit cause women don’t deserve a controlling man but she blocked me in everything (traumas from my older sister being physically and mentally abused by her fiancé for 4 yrs) and I don’t know what I should do I want to move on and I am I’m doing my own things trying to forget about her but should I give her a chance I’d she ever comes back and tries to start something? Or should I forget her completely because she didn’t break up with him immediately should that be a flag?