Here is a great quote from Nancy Guthrie on forgiveness. It comes from her book, Hearing Jesus Speak Into Your Sorrows.
Forgiveness isn’t minimizing what someone has done. Real forgiveness is far more costly than that. It says, “You hurt me deeply, but I’m not going to make you pay. I will pay. You don’t owe me anymore – not even an apology.” Forgiveness is choosing to absorb the pain and pay the debt yourself that you are rightfully owed, asking God to do a work of grace and quench the fiery anger in your heart.