Most Helpful Girl
I hate that type of guy. When I was in college there was this german guy who would f*** any available vagina close to him. He was such a horny-dog that it made me want to puke with the thought of sleeping with him. The sad thing was that he had a girlfriend and she came to visit him, nobody had the guts to tell her that he had slept with 50+ women while away from Germany.
Though it is horrible, this is not your problem and I don't know what is more humiliating having a guy cheat on you or some girl telling you that many people know he's a cheat and you're the last idiot to notice.
I wouldn't do a thing. It sounds wrong but then again its not my problem and if I informed her I wouldn't be appreciated for it eighther. However, I would screw him up in the office really bad and would spread the rumour that he is untrustworthy so that management never considers promoting him.1THIS IS NOT RELEVANT ANYMORE