Forgive. And as quickly as possible, forget. But don't you dare forget the lesson. The lesson being to completely and totally avoid those people and those situations/circumstances.
You either have to forgive someone or you have to forgive some situation/circumstance, and you can keep your peace with yourself. If someone makes you angry, in the quickest time possible, forgive that person. You are stuck in a bad situation or your circumstances are such that you are greatly troubled. As soon as the situation or circumstance ends, forgive the whole thing.
And you will be a peaceful person most of the time. There are also times when you have to forgive yourself. Just forgive. And let peace reign supreme.