Micah 1:10 Declare ye it not at Gath, weep ye not at all: In the house of Aphrah roll thyself in the dust.
More than one time in Scripture the Lord has taught us that we do not want the house of Gath, the Philistines mocking God or His people. We do not want them to know of our failures. We do not want the lost world to be aware of these things.
We want to deal with our problems. We want to be right and true but our goal is to not sully the name of the Lord. We want to take a stand against sin in our lives so that the lost world knows that we do not tolerate sin. We want God to be praised and magnified for the work that He is doing among us.
So go to the one has failed alone. Tell that person. Get it right there. If it need go further then take it to a faithful brother and fix it there. If finally you can’t fix it then take it to the church but be careful to judge what you judge in the house and fellowship of God.