Why are men blamed for cheating, When She cheats on him?

Okay. I personally take a dim view of cheaters, regardless of gender. I dont care who you are or weather or not you have a penis or a vagina, if you cheat, you're a monster. Recently i got into an argument with a woman over who is at fault for cheating. My argument was The person who cheats is always at fault. her argument was If a man cheats, its his fault, If a woman cheats, its his fault. Which is utter nonsense. How in the hell is it his fault if she cheats?

Why are men blamed for cheating, When She cheats on him?
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