Why would some (actually many) guys cheat & stay when forgiven but leave when they're cheated on?

I'm talking of the scenerio where guys would cheat on their s/o & if the girl decides to forgive & continue the relationship, well and good for them that she's forgiving and considerate of them but the moment she cheats, they'll leave, if cheating was so wrong, why do it & Even after doing, why stay with the person after cheating on them at the first place? Why accept being forgiven if they can't forgive? Married men especially.
Why would some (actually many) guys cheat & stay when forgiven but leave when they're cheated on?
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