Why do men insult the girl they cheated with when he gets caught?

What is the psychology behind it? Why do they put down the woman they cheated with when they’re the ones who put so much effort into it. They like to downplay the situation when really it’s their fault.
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I wasn’t cheated on. do they actually think this low of the woman they cheated with or is it all a lie so the ex takes him back?
Why do men insult the girl they cheated with when he gets caught?
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