What are we in here, a math class?
Dude; Karma is kicking your ass right now. You hurt this girl twice in a measly 3 years and you have the tenacity to come to this board and ask us for advice on how to keep her in your life so you can (more than likely) hurt her yet again in the near future... say what??? You're lucky she still talks to you.
You don't say how you hurt her? Care to share that info. Maybe you're not as bad as you have painted yourself to be.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion