Very dicey terrain morally. Also, remember it's you doing it now, but someday the shoe may be on the other foot.

Women cheat too, it's not just men.

Calling someone out for their bad behavior may make you feel superior but karma is a bitch. No one ever thinks they are going to cheat in the future, but shit happens.

Think about how you would feel/react if the situation was reversed. When I considered that, I typically chose to "mind my business".