Mind Mapping Confidentiality and Secret Sins

Your friend comes to you with a secret sin. You are his accountability partner, and he asks you to keep his sin confidential. How would you respond? Is it appropriate to pledge secrecy in these situations? Does the principle of confidentiality apply here, leading to confession and restoration ultimately, or might it hinder the very purpose for which confession exists? Should you ever tell others about someone’s transgression, even if they object? What biblical principles should shape how we relate to sin, secrecy, and sanctification in the context of the body of Christ?