Should I Post My Hubby's Best Friend on a Cheater's Website?

I (unwillingly) found out my hubby's BF (who he considers a brother) cheated on his fiance (not married by the Church yet-- we're all very Catholic)... Anyway, he cheated on her multiple times, and he repeatedly had sex with at least one of those women. I confronted him in front of the hubby, and said my piece. I know everyone would hate me for telling her the truth (my husband would've understood), but in the end I decided it was best to end all ties with the fiance (had just begun to consider her a very good friend). I know he cheated on her with much premeditation (not a one-night impulse thing)... I also happen to know he broke another girl's heart... I was tempted to post his name and basic info on an cheater's website (I would remain anonymous)-- just in case someone else could get hurt, but I'm not sure I should. I hope he won't cheat again (for her sake)... but Im not so sure... I really could use an outsider's perspective... Pretty please help... All opinions will be appreciated... Thanks in advance