What leads a married person to cheat?

What leads a married person to cheat?
I thought it could be only because of serious dissatisfactions, or because of a moment of weakness.
But a certain person keeps telling me she's happy in her marriage, keeps pressuring about it, and it's not her first experience.
I'm legit not understanding anything.
Updates:
5 d
Oh, apparently I should stop worrying so much because now I'm "starting to piss her off" and I'm not "risking anything" unlike her. Okay.
4 d
She said she'd help me out of a dead end position in my career, but I don't think it's worth it anymore.
But blewing her off too badly could sever any remaining chance I have to get out that lowly security job.
What leads a married person to cheat?
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