I am still in the process of uncovering my husbands betrayal, be thankful that was all it was, that is, if you are certain. I have found support through a Catholic counselor and we will soon be in Catholic marital counseling. Have you tried counseling yet? I know there is a Catholic marital retreat for troubled marriages called Retroville, my counselor recommends that retreat. I hope to go on it someday. Pray the St. Michael prayer for protection from the evil one, that is who is wrecking havoc on our marriages.
I am so sorry for your pain, know that you are not alone in your suffering. The pain is so deep and so broad it feels like it will never go away but with God all is possible.