Resentment always hurts you more than it does the person you resent. While your offender has probably forgotten the offense and gone on with life, you continue to stew in your pain, perpetuating the past. Listen: those who hurt you in the past cannot continue to hurt you now unless you hold on to the pain through resentment. Your past is past! Nothing will change it. You are only hurting yourself with your bitterness. For your own sake, learn from it, and then let it go.