(Picture a sticky note from God on a person whom you perceive has treated you poorly.)
“If thou, Lord, shouldest mark iniquities, O Lord, who shall stand? But there is forgiveness with thee,”
It seems like rather debating with yourself over whether or not you should forgive someone, you might want to think about this: If God, (who knows just about everything about everyone) forgives, you probably should think about it too. It is a very loving thing to do. And it is liberating as well.