Just forgive. Sounds easy, right? Actually, the words seem simple enough, but to actually forgive is another matter. You see, our pain causes us to react. We want the offender to pay for what they have done. They shouldn't get off free. So, in an effort to "pay back" for the wrong done, we withhold forgiveness. In the end, we are the ones held captive in pain when we don't forgive as Jesus commanded us.
Forgiveness frees the offender and frees the offended. Until forgiveness happens, the pain of offense in your life remains a festering wound. Forgiveness allow the pain to heal. You won't necessarily forget the pain. But, it will more like the remembering of a scar, rather than experiencing the ongoing pain of an infected wound.