Getting revenge is a sign of weakness really. A strong person would hold their head high and forget about them. Give yourself a couple months to let your feelings calm down. Your case is unique though because he's a married man. I do believe the woman has a right to know. If he's not going to tell her, someone should. I know others on this site will disagree but I'm just saying my personal opinion. I would tell her, not for revenge, but for the right thing to do. I would want to know if my husband was cheating and he wasnt telling me, so I could divorce his Nasty cheating a$$