
I’m holding a grudge against my friend. Is that ok?
Here's the answer:

God doesn’t want you to hold a grudge against your friend.
There are many things that can cause us to want to hold a grudge against someone. Sometimes, friends hurt us, and we want to hold a grudge against them. Maybe they said something mean to us, hurt our feelings, or betrayed our trust. If a friend did any of these things to you, know that your feelings are valid. Bring them before Jesus and rest in His comfort.
Your feelings are always valid, but Jesus doesn’t want you to hold grudges against anyone (Leviticus 19:18). When people hurt us, Jesus sees what happens. He knows the pain and anguish you feel. However, we need to trust all judgment to Him. We don’t need to take vengeance upon anyone because it is His to repay (Romans 12:19).
Instead of holding onto a grudge, we need to forgive (Ephesians 4:32). Forgiveness isn’t the same as reconnecting with a person. It is also not a sign that “everything is okay” or that what they did to you is “permissible.” Forgiveness is the choice of giving it over to Jesus and allowing Him to deal with the situation. Choose to forgive your friend instead of holding a grudge against them, and you will feel better in the long run.

Bible Truth
"Forgive other people when they sin against you. If you do, your Father who is in heaven will also forgive you. But if you do not forgive the sins of other people, your Father will not forgive your sins" (Matthew 6:14–15).
"Don't pay back evil with evil. Be careful to do what everyone thinks is right" (Romans 12:17).
"Don't say, 'I'll do to them what they have done to me. I'll get even with them for what they did’” (Proverbs 24:29).