First off, forgiveness is not about saying that something that happened is okay. It isn't even really about the person who is being forgiven. More often than not, forgiveness has little or no effect on the person being forgiven/denied forgiveness. Forgiving is about you and what you need. By not forgiving, you hold on to it; let it fester in your soul; let it eat away at you like a cancer while the other person blissfully goes on with their life. Who is being harmed by not forgiving him? You are! Who benefits by forgiving him? You do! It allows you to let it go and move on with you life.