best revenge to cheaters: forget about them, don't acknowledge their presence and get on with your life.
often times you will get this urge to vent out or get angry with these parasites. don't. that's what they need. cheaters are primarily whores for attention. they cheated with another because they can't get satisfied with the attention of one. once they're found out, they get an even better high watching the person they cheated blow up!
of course, there is the honest cheater...someone who was driven to cheat because of genuine love. in such a case, your presence around him/her is torture enough. also, karma.