To tell the truth, we often don't know exactly what God feels about the things we have to forgive one another for. We get very confused. There are days when other people seem to sin against us simply by breathing, and they don't have the slightest idea that they are even affecting us. We have to forgive them simply for being in the same world we are in, and for not placing us first. It's not their problem.
Forgiveness is a fascinating concept.
It is not simply about renouncing anger or obsession when someone has stepped on us. It is about getting ahead of our own feelings. It is about giving someone the benefit of the doubt. It is about cleaning the window of your heart in advance. It is about taking our hidden fingers off the scales of judgement.