Some things has to be said so that we will eventually believe it. Like forgiving a heart break. Generally, forgiving and moving on. We'll tell our self "I have moved on." when we saw our past walking hand in hand with a new person or when we saw them laughing while we are still hurting.
It is such pain to be the one still holding on. So we'll tell our self, "I forgive you."
Eventually, I'll forgive you and move on.