Why does God forgive us? We don't deserve forgiveness so why would He do it? Two reasons: He loves us AND He doesn't want to not love us. Forgiveness is more beneficial for the "Forgiver" than the "Forgiven". Sure, the Forgiven is now off the hook. But for the Forgiver, they can now move on and not hold bitterness and a grudge that eats at them from the inside.
Lord, help me to follow Your lead and Your wisdom and learn to forgive as it will benefit me as much as the person I forgive.