Why do cheaters (man) like the attention of other women so much?

I know women cheat too but I want to know about men.

I think they know that some day it will all be gone and then they need to find another person to make them like them.
I don't get why they keep going then.
I don't get what they like about it.
Why do cheaters (man) like the attention of other women so much?
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