Why do both men and women do everything they can to justify cheating, including blaming their partner?

worldscolide
The question speaks for its self. Its mind boggling, I could never cheat on my wife, i believe in honor, honesty, and most of all loyalty.. As does my wife. I cannot understand why someone would choose to hurt their partner like that, and then blame it on them..
Why do both men and women do everything they can to justify cheating, including blaming their partner?
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