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If you repented to God accept that God has forgiven you. When we ask God for forgiveness he forgives us and forgets the sin and he expects us to pick our lives up and move forward. YOU have got to forgive yourself, God has forgiven you and now you forgive and forget and move on with your life with your family. I would not tell him as you are trying to move on with your family and make life happy and he may not understand unless he is a child of God. But you layed it on the altar of God so leave it there and move on. When we ask for forgiveness and give God our problems we should leave it with God and not take it back. Forgive yourself and move on. Do not upset your family life now with something you ask God's forgiveness for and he forgave you. Now he expects you to move on with your life. God Bless You.