You can't do much in this day and age... as more and more divorces are being granted because of infidelities.  In the older days, you could have potentially sued the man for interfering with marriage relationship. That is not a remedy available today.Since the man has told you to discontinue contact, you need to cease contact so that you don't tempt a harrassment charge.However, you still have options if you think or want his wife to know of his activities.  You can filed for divorce, allege adultery as the basis of the divorce action, and the subpoena him and his wife to appear at the temporary order hearing for your divorce.  You don't have to go through with the divorce, but at least a temporary orders hearing will give you the opportunity to air the issues that you have with this man interfering with your marriage.  Another similar option is to file the divorce, but set up a deposition for him and/or his wife.