If we claim to be without sin, we deceive ourselves and the truth is not in us. If we confess our sins, He is faithful and just and forgive our sins and purify us from all unrighteousness. (NIV)
Oh, the sweet certainty of these words. "He will cleanse us." Not he might, could, would or has been known to. He will cleanse you. Tell God what you did. Again, it's not that He doesn't already know, but the two of you need to agree (my emphasis). Spend as much time as you need. Share all the details you can. Then let the pure water of grace flow over your mistakes.
Max Lucado, "God is With You Every Day," November 30 devotional