Who do you need to let go and finally forgive? Forgiveness is a deep well and returning for a refreshing can occur, as much as, you need. It may even be for the same set of circumstances.
The thoughts of the offense may rise again and again, but you must choose forgiveness again and again. Healing is more than a single event, it is an entire process with a beginning, middle and end.
The process produces wholeness, the deeper the hurt and betrayal, may mean laying it at MY feet, many times. Allow the power of the process to do its perfect work, continue to pursue the process in front of you.
As your conscious mind is ready to heal another part of the pain. It will come to mind and it can then be submitted to the ME, through your spirit. Trust MY process and you will be made whole.
Get rid of all bitterness, rage and anger, brawling and slander, along with every form of malice. Be kind and compassionate to one another, forgiving each other, just as in Christ God forgave you.