We do not destroy the picture and keep the negative. We totally let go of the hurt. When we cannot forgive or ask for forgiveness, we are in bondage. It is our responsibility to free the person we hurt from the bondage and communicate our sincere desire for forgiveness. Ask that person to forgive you with all humility.
Forgiveness is bitterness replaced with compassion and love.
Seek the help of the Holy Spirit to heal first that part of us that hurt others, show us how to melt our pride and put in our hearts the desire and ability to forgive, for strength and boldness to be able to communicate this desire. We need the Holy Spirit to bring to our awareness the people we hurt and the people who hurt us. Then act on it. Write a letter. The sooner we forgive, the sooner we are healed.