If a fellow believer hurts you, go and tell them — work it out between the two of you. If they listen, you’ve made a friend. If they won’t listen, take one or two others along so that the presence of witnesses will keep things honest, and try again. If they still won’t listen, tell the church. If they won’t listen to the church, you’ll have to start over from scratch, confront them with the need for repentance, and offer again God’s forgiving love.