Let me put this at another angle here for Ken ok pup?
Ken have you ever played Poker? Five Card Draw, Five Card Stud, Holdem is the most popular right now..
Basically your wife is RAISING you when she starts an affair.
YOU need to show her you have a hand here that she shoudl NOT be challenging... if you can't bluff her or GET some leverage someplace you have to fold your hand, and the marriage.
So you need leverage to persuade her to show her commitment.. the first item of leverage is just asserting yourself.
You don't ask her to stop cheating, you tell her you KNOW she is and you pack her things FOR her... show her you MEAN BUSINESS
You have kids yes? Do you think she will walk out on them? If you think she won't ever do that then this whole affair thing is a BLUFF.. CALL her on it by packing for her.. tell her she can have him or she can have her husband and kids... tell her to pick up the bag and go... see what she does...