“If another believer sins, rebuke that person; then if there is repentance, forgive. 4 Even if that person wrongs you seven times a day and each time turns again and asks forgiveness, you must forgive.” (Luke 17:1-4 NLT)
Jesus tells us two important things in these few verses. First, don't be the source of temptation. Don't cause anyone to stumble and fall into sin.
Second, forgiveness is not an option. God forgives us. We forgive others. Forgiveness is letting go, not holding a grudge, not letting the person or the hurt that they cause control us. Forgiveness changes us. It does not necessarily change the other person.