Should You Stay with a Cheater?

I get a lot of people writing in about whether they should stay with a cheater who's cheating on them, a reformed cheater, a cheater in disguise, a cheater who is proud of their cheating, etc.

And most people in the red pill insist a man should never stay with a cheater (but most always endorse across the board a woman should be obligated to stay with a man who cheats, beats and skeets).