What is the way to hold accountable a person who falsely accused the questioner of sodomy, and what is the questioner entitled to do to clear himself of this accusation?

A Muslim accusing his brother of committing an immoral act without evidence is a serious matter. If the young man falsely accused you of sodomy, you must refute this accusation and clarify the truth if his words would lead to the widespread dissemination of the matter. You have the right to report him to the responsible authorities, but forgiveness is better. However, if the discussion about this topic has concluded, it is not wise to revive it now, as it may cause greater harm.