I see this type of quote a lot, but it isn't biblical. Being sorry (repentance for an offense) is required for true forgiveness to be granted. Luke 17:3, Matthew 18:15 Letting go & letting God handle an offender is often necessary because an apology or change of heart will never come; however, true forgiveness is being able to go forward in a relationship as if the wrong never happened. God only requires this if repentance occurs. He doesn't require us to be okay with continued mistreatment.