When W cheated/left she ripped your sense of stability away from you. From your perspective you didn't do anything to deserve it, you couldn't stop it from happening, and you couldn't put things back together afterwards.
That would make anyone feel totally out of control, spinning down the drain, and that is a horrible feeling!
You are trying to analyze and understand everything so that you can build it into a rational model so that it will never, ever happen to you again. If I can avoid doing X, then Y will never happen. In addition, you want to unlock this puzzle, to deconstruct it so you can find the solution that will allow you to rebuild it. Finding that key would provide immense comfort.
Your brain has convinced itself that getting W back, or getting W to apologize and declare a desire to have you back is the very best and fastest way to restore your feeling of being in control.
With the benefit of time and distance, you'll realize that's what it's really all about, it's about regaining the ability to feel in control of your life and your future. It really has very little to do with W or who she is as a person, she's a lever to get you what you want, but that's really just an illusion.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712