If you love her just talk to her, i had the same shit happened to me and my gf, we were going out for 1 year and a half and she played me for 2 months, well not played me but she was talking to another kid... i found out and she did everything possible to get me back, she even got a tattoo of my name and everything i told her to do she did, i told her to burn herself and she did, i told her to get in 4 legs and bark like a dog, i also being an ******* i fuked her while she was crying and threw her in the floor and called her a hhooee... well, 4 days go by and i find out that she was about to slice her vains bcuz i wouldnt go back out with her, ive been through alot with this girl and i really loved her so did she love me, just listen to this man, if you love her then do whats right, put the past behind you, every one makes mistakes.