If we get so angry and do not forgive, you give the person the power to hurt you twice.
One from the wrong they did you, and another from the anger and negative energy their wrong placed in you.
And subconsciously or unconsciously anger and negative energy holds you back, it takes up space in your mind that you can free up to think of greater things.
So instead of thinking you are doing him a favor, begin to think like this.
I want to get rid of every negative energy this person has placed in me, think of yourself, forgiveness is for you, restoration is for him, and nobody is asking you restore someone who is not repentant.
When you understand that concept, and you know you want your mind, soul, spirit and body to be free, you will work out the forgiveness.
It can start little by little or it can be instant but what you must do is go within yourself and bring up that hurt and anger you feel towards him to the surface, you have to bring it up, feel the pain consciously, feel the anger consciously but this time, your aim is to release it, so everyday when you feel the pain and anger, you decide to forgive and make it clear to yourself that you will no longer harbor this energy within you.
I don't know how long it would take, but if you work at it, one day, you would not believe how light and free you will feel, and when you think of him, you will just shake your head in pity, that someone can be so blinded to the error of their ways, but it will no lobger have an effect on you.
Forgiveness of deep hurt by close people is hard work, very hard and painful process but you must do it in order to be truly free and joyful...
Thank you for sharing, @pioner888777
RE: How to deal with anger