There is a quiet test you can apply today to see whether forgiveness has taken root. Notice what you do with the story.
Do you tell it to explain your position, or to describe what happened? Do you still add the details that make you look better and them look worse? Do you rehearse it when you cannot sleep? None of that means you have failed. It means the wound is still open, and open wounds are supposed to hurt. But the direction of travel matters. Forgiveness moves you from rehearsing a debt towards releasing it, in slow stages, without needing the other person to co-operate or even to know.