It seems to me that the truest measure of forgiveness is not how we feel about the person we have forgiven but how we perceive and treat the next person. If we have let go of what happened, then we can relate to other people without emotional baggage. That seems to me to be a clearer indicator because the original relationship may be cluttered with all kinds of mixed feelings and history. It's easier to step back and assess the new relationship with a bit of detachment. Does all this energy really belong to this new situation?