The Living God is merciful (Micah 7:18-19, Ps 103:8-14, Jonah 4:2, Ps 86:5). Our greatest need is His mercy (Rom 3:10, Rom 3:23, Rom 6:23, 1 John 1:9). When we, by grace through faith, are forgiven of our sin, we are to be as forgiving of others as God is toward us (Eph 4:32, Col 3:12-13).
No matter the harm done to you by another person, let not mercy and grace fail in your heart (Prov 11:17, Matt 6:14-15, Luke 6:35-38, Heb 12:14-15). Leave the offense against you (i.e. against God, Ps 51:4) at the foot of the Cross, thanking and praising the Lord for His forgiveness of your offenses against Him.