If you found out your best friends wife was cheating on him, what would you do?

I just got yelled at by two pieces of human excrement for telling the best friend what I knew. Holy shit.
I'd tell him because I'm a good person.
I'd not tell him because I get sick pleasure off of betrayal.
Select gender and age to cast your vote:
If you found out your best friends wife was cheating on him, what would you do?
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