Unforgiveness is like drinking poison hoping the other person dies. Unforgiveness causes bitterness and diseases such as Fibromyalgia, Chronic Fatigue Syndrome, Cancer, Heart Diseases, Constipation, Skin Conditions, Insomnia, Depression, Anxiety, etc. When bitterness takes root in our hearts, an avalanche of negative emotions will eventually overcome us physically, mentally and spiritually. Be reconciled with the person who hurt you...forgive so that you will also be forgiven by God.
But if you don’t forgive the wrongs of others, then your Father in heaven will not forgive the wrong things you do.