Why do people beat the person their lover cheated with?

What if the person they cheated with had no idea though

@KaterinaPetr0va: too bad, so sad.

@CobaltToad: Their partner owes them loyalty, a stranger does not. And cheaters are [b]not[/b] always honest about their status.

@bijouxbroussard: I jest. My ex cheated on me with her patient. Lost her job. Married the guy. My children are miserable. At times, I wish I could beat them, but my watching them reaping the misery of their own bad decisions will be the best revenge.

@CobaltToad: Ah, indeed. What goes around comes around, they say. 😕

@bijouxbroussard: It was a horrible way for the marriage to end. Threw me and her career away. 2 years later, are writes me an email apology. Still doesn't get it, but at least she's miserable.