Ok here is a guys imput -

He may add a little bit of a macho spin to it, but when he is talking to his guy friends he is probably more truthfull. Who knows though, I would be the first one to joke about somthing like that, but the last one to do it. If you thought he was cheating, and he says he was than most likely he was.

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An eye for an eye makes the whole world blind.