Well what would u do?

Tell him how you feel about it.

Look at The Reason Why.
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Look Who’s Cheating Now?
Are men the only “villians” in the infidelity game? Nope! A reported 50% increase in adultery among woman, tells us that wives and girlfriends are fast joining the “cheating hearts” club.
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So what’s the scoop? Are more women really partaking of the same adulterous rendezvous’ that they have long condemned males for? Yes, they are. Their reasons for cheating may be very different but they are cheating!
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Often men cheat on their wives purely for the joy of sex. They aren’t getting enough at home, so, they go for the “married but not getting any - no strings attached” routine. Pure, sexual gratification is really all they are looking for. They have absolutely no desire to change their current situation or disrupt their family. Considering sex to be a natural male, physical “need” and disassociating it from “love” can justify cheating for a man.
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For women on the other hand, things are not quite so simple. They are more likely to misinterpret the intimacy of sex with another as emotional closeness, something they feel they are lacking with their husband.
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Today’s busy families seldom connect for more than a few minutes out of each day. The lack of communication between spouses can make it very easy for a woman to feel neglected or taken for granted.
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Men rarely leave their wives for their mistresses because there is no emotional involvement on their part. It’s just sex. Women however, thrive on emotion and crave intimacy. They are much more likely to leave their current partner for what they believe to be “true love”. Often, they discover too late that their sexual partner had no desire for a long term relationship in the first place. Men, just sex - remember?
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Couples need to take time out each day to talk to each other and listen, really listen. People rarely do that anymore. Often the signs of a disintegrating relationship are right under our noses but we have stopped looking at each other so we don’t notice until it’s too late.
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Think about it. You spend eight hours a day, everyday with a flirting co-worker while at best, you spend maybe one hour alone with your spouse after a busy day. And what are two of you doing during that hour?
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Remote control in one hand and scratching with the other, the husband is thinking about that “hot” secretary he “banged” during his lunch break today because his wife was too tired to put out last night. No big deal.
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And the wife? Based on feelings of false euphoria, she has made the decision to “work late” with her co-worker tomorrow. He makes her feel sexy and desirable.
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What a waste!
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It’s 6 PM and there is no supper on the table… guess who’s cheating now?

if they loved u they wouldnt have done it in the first place, no i wouldnt cheat back , thats just childish and putn u on there level , i'd walk out , once a cheater always a CHEATER , whats to stop them from doing it all over again , u deserve better than that , plently more where that came from

dump him , ones a cheater always a cheater!

Goodbye to him..its his lost not mine.

Well i dont believe that 2 wrongs dont make a right, so after i pulled myself together i would walk away with my dignity in tact, and hope that one day they to would experience the same pain.....Karma has a funny way of coming back!

that's the end for the two of us...
if he did it once he can do it again!!!