Forgiveness between humans is unequal to any other human act. It is not forgetting, because forgetting is accidental. It is not to say something doesn't matter, because if it didn't matter, nothing would need to be said. It cannot be ignoring, because sins have side effects which remain and sometimes cannot be ignored themselves. Forgiveness is only forgiveness.
Forgiveness requires us to love a person more than the heinous pleasure we derive from holding that person's sin against him. If we do not love that person more, we must yet forgive, for God demands it of the forgiven. So to forgive is to learn to love, and to love is--among us, for now--to forgive.