If your brother sins against you, go and show him his fault, just between the two of you. If he listens to you, you have won your brother over. Matthew 18:15
The right thing is so hard to do sometimes. It seems so much easier to gossip about someone who has wronged us, or to mention them in a group prayer as needing help, or to pass around an innuendo when talking about struggling Christians. But, only one thing is the right thing when we have been wounded by the action of another brother or sister in Christ! Go to the person who has wronged you, try to keep the damage contained to just the two of you, and work on being reconciled. This is God’s desire, and should be our goal as his children.