Wow! well I waded through the long post and think you are doing great. It is no easy thing to take of the rose coloured spectacles.
I haven't kept up with all your posts but read some.
Not quite the same but my x and I had a favourite Greek island that we visited many times it was "our" place. Guess who he took.
I spoke to him about it and I could tell he had no idea why I was upset,that was then ,this is now was the attitude (although we were still m) the best he could offer was "well we stayed at a different hotel"!
They really do not connect the dots. I am not even sure they ever feel guilt or remorse,like people say they do.
I can't believe he spoke to that lady like that!

I am sure you will find the strength and courage to do what you feel you have to.
I would just look at the now,who he is now and later when you are ready you can look back and examine who he was then.
I feel you need to hold on to some better things from the past otherwise it seems our whole life was a sham.
You need to be truly done and strong to look back, so save it for later.

All good wishes. Be kind to yourself and take care.