Girlfriend doesn’t understand how I can love her?

You can't build anyone's confidence, and until this girlfriend stops living in the past and worrying about everything under the sun, nothing will change about her outlook

man you are in for a wild ride with this chick, I dated someone like that and it was a real pain, not much you can do she is the one who needs to probably get some help. You will see it will get old after a while. Counseling and therapy will help her a lot to understand what happened to her, trust me it doesn't matter what you do is not going to change her, she is the one who needs to work on her own issues brother. being there done that my self.

Yea I understand how your girlfriend feels because I have these same issues too. I also had a terrible ex boyfriend but really what it stemmed from for me was the emotional abuse from my mother.

To be honest what she probably needs is counseling. But what I would do if I were you, would be to just explain to her that it's okay if she doesn't fully trust you just yet, because you are willing to prove with time that you are dependable. Explain that you don't need/expect all her trust just yet. But also explain that you do eventually deserve someone who trusts you, and that you're happy with helping get her to that position, but if it's years and years of her not trusting you then that's not exactly fair on you. I know that sounds tough to say, but trust me when I say that the last thing you want to do is enable her, because by having firm boundaries you're actually motivating her to recover. If she feels like she can just have trust issues for the entire relationship, and you'll just be more loving every time, then she won't have any motivation to recover. So be there for her, but be firm too.