Unforgiveness is not a joke. It is a serious issue that plagues the world today. Holding onto it is like drinking poison while hoping the other person will die. The fruits of bitterness and anger hurts you more, becoming a heavy burden that weighs you down wherever you go.
Can you see the damage it does, or is the pain in your heart keeping you in the darkness of unforgiveness? God's Word is clear that we must choose forgiveness regardless of the wrong done to us. The way we forgive others is the way we will be forgiven. (Matt 6:14-15).
Forgiveness is a divine command. Refusal to forgive blocks God's forgiveness and opens the door to many unfavourable situations you're in. Take forgiveness seriously for you are a product of it. May the Holy Spirit fill your heart with His grace to obey His Word, in Jesus name.