What's the deal with cheating?

When someone is cheating, they aren't thinking of their spouse at that moment. They are enjoying it for sure. I'm trying to understand it. I'm trying not to be judgmental. I just don't understand. Why would anyone want to cheat on their partner and make them feel downhearted and/or stress.

I can't ever imagine cheating on my fiance nor staying with him if he cheats. What's up with cheating?

What's the deal with cheating?
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