I have been haunted for years over what happened with one of my exes?

It was a closure issue. I’m know I’m never going to get it but what she did at the end and more specifically what she said to me absolutely devastated me. I accepted (and quasi wanted) the break up at the time. I accepted it and because I really loved her and wanted her to be happy. If that meant a future without me than so be it. True love isn’t about possession. It’s about wanting what’s best for someone else. But she inexplicably treated me like I was less than human afterwards. I found a year ago through a mutual friend she cheated on me. I never saw that coming.

If tried to personally resolve in my head for years on end now. I’ve been in two other relationships since then that also ended badly but I rarely think of those incidents nowadays. However with her it’s a demon that just won’t quit. I wish I could get a lobotomy to forget everything about her.

Does a last resort option exist for dealing with this?
I have been haunted for years over what happened with one of my exes?
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