You hurt me deeply and I forgive you for what you did to me.
Thank you, but I don't understand what I did to you?
You know what you did.
I know that you're hurt and it's very good to forgive someone that hurts you. You need to talk with your friend and tell them how they hurt you. This will prevent future misunderstandings in the future between you and your friend.
I know what happened, and I STILL forgive you. I am a great friend.
Good that you've forgiven them, but don't be arrogant about it.