<human>: Can you succinctly summarize the text in 1-3 sentences?

About six weeks ago I found out that my girlfriend of 2 1/2 years had been cheating on me with her abusive ex-boyfriend so after asking my cousin if it was the right thing to do, I left her.
After getting massively unfit from comfort food and had very dark thoughts I decided not to continue being a little bitch and sorted my life out; however we've both gone back to college now and I tried my best to ignore her and carry on with life but it is now getting a bit tough... 
A mutual friend told me that the ex boyfriend really badly hurt her physically which involved her dad needing to basically force his way past to get her home. I now feel terrible as I always promised to keep her safe.
I spoke to her today and I'm starting to feel for her again so I need your help.
<bot>: Not sure whether to get back with ex-girlfriend who hurt me a lot physchologically but she got physically abused by guy she cheated on me with.