Steve, I certainly do think about all the ways I contributed to our MR breakdown. I've identified that I was too much of a nice guy, put her on a pedestal, needed her instead of wanting her, got too comfortable etc. I'm working on identifying these things and applying 180's on them.
Having said that, I've also accepted that the reason she became WW was mostly due to her own personal issues. She's having a full blown existential crisis and our MR is the collateral damage. I think forgiving myself for not being the cause of her actions is helping me heal.
AnotherStander, you're right. Either way what she says doesn't matter. I know the reason for the separation, and I journaled the exact details of how things went down whilst they were still fresh in my mind.
I'll never forget about the blatant lies she told me to my face when I confronted her that night. That's when I truly realised my W was a different person.