Secret Sins

Confession, Forgiveness, and Restitution

Q: In order to be forgiven, must we confess our sins to anyone but God? If we wrong someone, do we have to confess it to them, and make restitution even if they didn’t know they were hurt by our actions?

For example, I have a friend I committed a sin against several years ago. I wronged them terribly, but they never had knowledge of it. I have since confessed to God this sin, and turned away from it. Am I completely forgiven, or do I need to confess it to the person to finish the deal? I am on good terms with the person as of right now, but if I tell them about this it could change our relationship.