I agree with this. Your friend seems to fail to realize the wife knows as well. If she feels guilty and tells her husband then it isn't on you.i would tell your friends wife. Put the ball in her court. Let her either get out in front of it if it's a lie or let it drive her crazy for you to know.
You don't mess with someone's spouse; even worse you messed with a friend's. That's incredibly shallow.
Sent from somewhere in the Twilight Zone.