I'm sorry you're having a tough time with your girlfriend. As someone who has abandonment issues...it's like I see the world through a filter called unlovable so I see any perceived slight or even normal comments as evidence that I am in fact unlovable. My pattern is to cut things off if I get hurt, perceived or not, and run so I don't get hurt any further. I need assurance on a regular basis that I am in fact loved so when she said you weren't fighting enough for her that's where that came from. I am, in fact, working on this is therapy.

You've let her know you want her back. Maybe give her some time where you are truly giving her space so she can think things over and get her ducks in a row and maybe she'll come around and even contact you first. After some time of giving her space....try again. Good luck. I hope it works out for you. You seem like a nice, quality guy. Just remember...you might have to deal with these issues for the duration of the relationship unless she gets help.