Something else to concider.
If you told the wife and out of this knowledge her marriage fell apart. could you be ok with that yourself? Does this man have kids, don't remember reading that. Again, if so, do you want to be the reason thier parents split? Can you make this situation ok in your mind. As sweet as some people believe revenge is, it can leave a bitter taste. I understand completly with you capecoralcouple. I too was a spouse who was cheated on. I was angry at all the people who knew about it. But friends are different then the women, who in this case was a victim of the situation as well, Friends and family are suppose to look out for you. It is not this woman's responciblity, our OP leaves this man then I think she did her part for the wife.
Good luck to you.
It seems you have some difficult decisions to make. Be sure you can respect yourself with what ever choice you make. That is what is important here.
Your friend,
Prettylady