As a counselor for years I have had people tell me I can forgive but I am not going to be able to forget. Well guess what, you are not supposed to forget. It is the not forgetting, and being able to reforgive every time you think about it, that makes you strong and helps you mature.
God does not command us to forget. He commands us to forgive every time we need to forgive. That means every time the event comes up in your mind you need to reforgive.