How to forgive my girlfriend of 5 years for cheating on me with my cousin?

Anonymous
My girlfriend and I have been dating for five years, since high school. She is the only girl I have slept with and I was the only guy. We had been having some relationship problems as of late. Basically she told me she was going to visit her family and instead she flew down to party with MY cousin over Valentines day! While she was there she got drunk and kissed him. They then had sex but claim they didn't finish. She says she is sorry and never meant for it to happen. I don't know if I can ever get the image of the two of them out of my head. Any suggestions?
How to forgive my girlfriend of 5 years for cheating on me with my cousin?
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