Sandi when she speaks of her own situation as a WW, she mentioned something about this. If memory serves me right, she too was shocked and dumbfounded that her H didn't want her anymore. She was a WW with all that entails and disregarded her H and his viewpoint/feelings as secondary to her own. When he got to the point of saying enough was enough, she genuinely was taken by surprise. To the point of "how on earth could he not want to be with me". It was unimaginable to her!!
Many speak of the WAS expecting the LBS to be sitting right where they left them waiting. That is probably true to some extent, but I doubt it is thought out consciously. It could be an unconscious assumption.
Maybe a part of it is that they do what they do because they HAVE TO not because they chose to. It was necessary in their eyes to find true happiness. Surely that is understandable. How could the LBS not understand that!! Incredible as it may seem, it probably is exactly how your ExW views this.
Whereas I find it healthy to seek understanding, certain parts of M crisis will never be coherent nor understood and we waste our time delving to find that elusive answer.
I am glad you are enjoying your life. Nature is great. Enjoying your own company and not needing others can be a good thing. BUT I read recently that one aspect of being truly happy comes from having interactions with people. There is a YT video that explains the difference between having pleasures and happiness and the main ingredient was to be truly happy interactions with others are required.
Best wishes
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together