I'm surprised by a CNN.com poll where it's 50/50 on if you'd tell a friend if you knew their partner was cheating on them. I don't understand. The idea of "Stay out of it because it's between them" just doesn't apply in my humble opinion. In order for it to be "between them", BOTH parties would have to have full knowledge and therefore be able to make decisions concerning the future of their relationship.
Assuming there's no misunderstandings, it's a fact there is cheating going on, not just suspicions. Wouldn't you want to know?
Wouldn't you tell a friend if you knew their DH was cheating on them?
For debate sake (poll aside) would you tell ON a friend?[Poll]