Forgiveness is for you, not the abuser. You don't even have to tell them or ever talk with them about it. In fact it probably wouldn't do any good because most people won't admit their wrong doing. In forgiving, you are NOT denying anything bad happened or making what they did all right. You are ridding yourself of toxic emotions. It is a hard process. You have to decide to forgive or not. But I guarantee once you do forgive you will have a lighter heart. All the negativity and bad feelings carry a lot of weight. I have had to deal with this with both of my parents, separately. PM me if I can help you with this.