bearing with one another if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive Colossians 3:13 ESV
An unforgiving spirit binds you, not the other person! We often hold to bitterness because the person doesn’t deserve to be forgiven. But all we do then is make the situation worse for ourselves. On top of being disrespected, lied to, or abused now whenever we hear about or see this person we are enraged. We are allowing the devil to continually pour salt on a gaping wound. And usually the offender has moved on.
Forgiveness is not trust. Don’t forget that. Regardless of what they deserve; you deserve to be free from the bondage of bitterness. Letting go doesn’t mean that you have restored confidence in the offender; it just means that you are choosing to be free. If you really want to get back at someone don’t let what they did have any effect on you anymore! Let it go in Jesus’ name.