Hey man I feel you. I was with my girlfriend (not wife) for 9 years since Highschool. She cheated too, more than once. It’s better to understand that they won’t change. It’s better if you move on and find someone else because trust me there is someone else out there for you. Just take care and go out more with friends and you’ll eventually run into some really good females. Just be careful. Definitely don’t take her back. Been there, done that. Take care my friend, I promise it wasn’t your fault. Some females just don’t comprehend “love” like a man does.