Should cheating be punished?

Should cheating be punished?

I just saw the movie Minority Report, to freshen up your minds, there was a guy at the beginning who found out his wife was cheating on him. So he wanted to murder her and the guy in a rage but because in the movie police can arrive at the place of crime before the crime actually happens they stop him and arrest him.

So that got me thinking, I know murder is wrong and far too extreme but shouldn't there be like another penalty for cheating while in a marriage?
Should cheating be punished?
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