Why do guys cheat ? And if you are a guy that doesn't cheat why don't you ?

Hi :) Basically I'm asking the title ? Why do some guys cheat ? And those who don't, why don't you ? Ie scared of hurting your Gf, or you are content/ committed ? thank you :( And this isn't a sexist post, I'm a heterosexual female so I want to know about guys ... Feel free to comment on women too though (if you really want) Lastly Anon or delete please :)

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