I have learned that it is best not to dwell on negatives, but to move forward instead. I have had to end toxic relationships with people I love dearly. I still love them, but I have worked far too hard on not dwelling on those hurts to spare them or their authors much thought. When it gets so bad that you react to stress from them before they ever say a word - it's time to go.
I'm not bent on retribution or revenge...I haven't the time or inclination for that... Why become just like what it is you despise?