Forgiveness is first for you, the forgiver...to release you from something that will eat you alive; that will destroy your joy and your ability to love fully and openly. Do you think this man cares about the pain and torment you have gone through? If anything, he feeds on that knowledge. Don't you want to cut that off? And in doing so, you'll release him from a burden that he carries whether he knows it or not--acknowledges it or not.