I know my Area VP slept with a rep

Send an anonymous letter to the guys wife, simply point it out, that Dear Mrs. _______ I just thought you would want to know what kind of "Man" you are married too. He is sleeping with __________. I am sure he will deny it, but I have not purpose or gain in letting you know other than to let an innocent wife move on without the SOB husband. Sorry, but I felt as I had a moral obligation to let you know.