Why does it still matter?

In the space and time that has passed since the separation and divorce, I have realized that I am better off.  I have so much more energy.  I'm developing some great friendships that are so positive.  I'm learning new things about myself and developing new skills.  I'm leaning into the joy of life more than ever.  I'm healthier maintaining the weight I lost last year, eating differently, and joining exercise classes in addition to walking more.  Surprisingly, I'm even feeling good about my financial situation, something that I feared most having to support myself on my one, quite a bit lower salary.

So the divorce was good for me.  Some might even say "all's well that ends well."

So why does it still matter that I have so many unanswered questions about what happened last year, why he made the decision to dump me, and why he treated me so poorly in the process?  Why am I still stuck on not understanding what was in his head?

No matter how much I focus forward on the good ahead of me, I still can't shake the bizarre turn to last year, the disconnect to anything that makes sense to me.