How do I tell her that he's cheating on her?

StephanieJ123

My best guy friend who is like a brother to me told me that he's cheating on his wife with another female acquaintance. He said only me and 3 of his guy friends know about it. I really hate cheaters and feel like I should let his wife know out of respect. But how should I do it so that he doesn't know it was me? I don't want to lose him as a friend but I think it's a bad mistake that she deserves to know about.

How do I tell her that he's cheating on her?
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