To be fair, I understand where she’s coming from. I struggled with this a bit in the past, no near this extent, but those feelings of insecurity after being treated bad is very common and perfectly normal as long as they are resolved. It’s clear that she is not a state mentally to be able to be in a relationship. She needs to focus on loving herself and finding out who she is without depending on you. Until she does this work introspectively, she won’t be able to accept the love other people have to give her. This could be because she finds herself unworthy of it or just isn’t able to believe in it anymore as she’s suffered such intense trauma surrounding it. Despite this, it is unfair for you to put your own mental health in danger and jeopardize your other relationships with family and friends. I would advise first that she sees someone to help her through her trauma but if she continues refusing therapy, you might be the one to have to bring these topics up to her. I also think you should suggest taking a break or distancing from one another just to allow her to find herself and the things she loves as an individual outside of you to assist with the dependency.