Don't look a gift horse in the mouth. You have been given a reprieve and a chance to rebuild your M. Do not underestimate how extremely fortunate that is. Focus on your W and finding joy in your life with her. Learn to let go of this OM and let him sort out his own problems -- those are between him and his W.
If you are still feeling all this vitriol towards someone that really looks to be out of the picture for you and your bride, then you need to work these out lest they poison this chance you have been blessed with. I advise you to seek some form of IC to help work through these negative feelings you're allowing yourself to suffer.
I am a bit envious of your fortune, dude -- be happy! Onward and upward, bro! Rejoice!
