Paul in Ephes. Because of God's forgiveness through Jesus' sacrifice on the cross, we are cleansed, righteous, and justified before Him. That verse says that since we still sin we need to continue to confess those sins to keep our relationship with God unobstructed. That is exactly what needs to happen in relationships. We still hurt each other and need confession and forgiveness in order to reconcile and keep our relationships healthy and loving.
Forgiveness is one of the keys to trusting another fallible human being again.
Thirdly, God can help us forgive . God can bring the healing and realistic trust back into our relationships. Who strengthens me. He has been wounded by your words. If he is not a Christian, ask him to read my article on faith .