Instead, be kind to each other, tenderhearted, forgiving one another, just as God through Christ has forgiven you. (Ephesians 4:32 NLT)
Forgiving those who have wronged us isn't always easy, but it's always right to do. The reason is because we've been forgiven so much ourselves that there's no excuse for not extending the same to others. You don't have to repeatedly subject yourself to people's hurtful ways, but you do have to let go of the anger, bitterness, and desire for revenge they've caused. Those negative emotions/inclinations will ultimately destroy you, not the person that wronged you.