Why do you cheat? ... on your partner?

So many friendships, relationships, F-B, and FWB... come down to the simple, wedging act/aspect of "cheating".

Why do you?
..and why isn't your partner good enuf?
Updates:
+1 y
Do you think or feel you are cheating them... or yourself?

...and, if the game cannot be played by the rules, why not just leave instead of cheating?
Why do you cheat? ... on your partner?
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