Why do men have this belief that a woman who cheats is worse than a man?

Anonymous
I read something on twitter from a man who said that there are no good people in the world after he found out that his girlfriend was texting another man. He continues to say “I know I cheat but when it’s done to me, I can’t handle it”. Of course someone posted those tweets on Instagram and the comments were horrendous. I was surprised that so many men didn’t find a problem with cheating, however the only problem was when they realized their girlfriend was unwilling to allow it and they cheated back. Basically men had a problem more that a female cheated on them rather than up and leave the relationship.
So my question is where did this idea come from that a man cheating is wrong and forgivable, yet a woman who cheats is the worse and unforgivable? I don’t agree with cheating. However, I’ve been in situations where I realized anything is possible when emotions are involved. We are all human and can be vulnerable in certain situations.
So why should a woman accept a man that cheats but a man shouldn’t?
Why do men have this belief that a woman who cheats is worse than a man?
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