Quote:
Cheat on her before she cheats on you
Pathetic, don't do that..
Man, the way to get over this is to forgive yourself first.. This is general to any mistake you have done really. If you can't forgive yourself for what you have done, you will never get over it. As for your girlfriend, girls will most likely cheat if you are not treating them the way you should. That doesn't mean doing being nice and getting them stuff all the time. It simply means, keeping your relationship fresh and always doing new things that will keep her interested in you. Don't fall into a routine with the way you interact with her. It gets boring and the initial interest she has in you will fall down leading her to cheat on you one day.
Another main thing that keeps a relationship strong is having good sex.. If she is not satisfied from your sexual performance then she will look elsewhere.. That doesn't mean knowing every spot that hits her orgasm.. Include emotions, variety, immersion, and dominance to that. All of those 4 factors are crucial to your sex life with her. If you have all of those, she won't look elsewhere. I would suggest reading "make love like a sex god method".. It explains all the things I was talking about.