Can someone explain the need to cheat

Lizz • May 4th, 2015❤️💕😍👌🏻💋 2horses🐴 and I bowl🎳
This is not my case I'm just curious..
But if you were not happy in a realstionship wouldn't you just leave instead of hooking up with other people?? Like that's a guilt I wouldn't be able to live with.. If I wasn't happy id just leave.. Just why I'm curious? 

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