Why cheat on someone instead of being single?

I've always wondered why people cheat in relationships instead of just being fwbs or just friends. I've been cheated on so I know how that feels but I never understood why people do it and then try to be sneaky about it. When there caught the cheater acta like your the problem. If that's the case then I feel like if you have enough courage to sneak around on someone them you should be brave enough to tell the truth. Is it to feel empowered? Or is it something to bragg about to your friends
Why cheat on someone instead of being single?
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