I have given this much thought. Many friends over the years have asked me if they should confess to their lovers. I have come to see it is a selfish act. While most religions and 12 step programs say confess as the Catholics do. I say no. You are crushing the innocent partners soul with your confession. Sometimes it's better to take responsibility for your actions. Live with the pain of what you did. It will help guide you next time. When one laments the wrongs of their life it creates these pains. They are called the conscience. So live with them. And try to be better next time. I have made many mistakes and I shall atone for them in the end. I did these things myself and it is not for others to suffer the consequences. I am glad I will take my own transgressions with me. After all I am responsible for what I do as is everyone. I have spent many years trying to reconcile with myself. I am not saying I did anything truly awful. However I let myself down more than a few times in my youth.