Tell Friend about Cheating Husband, or Keep Quiet?

My best friend, jimmy, who had been having bad luck the past couple of years developing good relationships, finally met the "girl of his dreams." There was only one problem: This girl is married.

I am also friends with the girl and his husband, jerry, and one day jerry told me that he had heard her wife is having an affair. Because I know his wife, I and the couple have many mutual friends; jerry asked me if I had heard the rumor and, if so, if I had any information. Jerry was shocked and distraught about the news, but was hoping to work with his wife to save their marriage.

What should I say?

The people involved in this dilemma are not only me, jimmy and the couple, but the couple's family, as well. If I keeps jimmy's confidence, certainly that would benefit jimmy, and, possibly, his lover. On the other hand, if I tell jerry what I know, not only jerry but his children could begin the healing process. And, maybe it's not too late to save the marriage. On the other hand, I risk losing her best friend if I tell. All in all, however, it seems more people would be helped if I talk.

Which would be the higher right in my mind–always to tell or never to tell?

I chose not to talk, but unfortunately the couple ended up devoiced…

I have been always thinking if there are better solutions there…