What will you do if you discover your boyfriend had an affairwith his co-worker?

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I opened an account in friendster for my boyfriend and before passing it to him, I decided to add 3 of his female co-workers. when I informed him about it, he doesn't seemed to be interested. I decided to maintain the account for my blogs and occasionally i check the updates from his coworkers. As I was browsing through one of the profile, (call it instinct or whatever) I sense that the "HON" that she was referring to is my boyfriend but I did not have any proof yet, just gut feeling. One day, I opened up her blog and looked at the albums there. I saw under the title of "mah Hon" his and her pictures (separately though). I felt cold all over and just didn't know what to do. I went to their office and talked with the girl and she admitted that they had an affair for a week or so. I talked with my guy but he denied it. I'm still with him but I don't if our relationship will last because he destroyed my trust in him.