Everything on your list matches so perfectly to the things I am holding onto/can't get past. If I felt W was truly happier and better off without me, it would be a lot easier to let her go. But when she has made no real moves toward an actual divorce, has stopped eating/cooking/grocery shopping, is suddenly focused on drinking and smoking, and has developed some strange obsession with her phone and inappropriate friendships, I have to say it doesn't feel like this is what she truly wants.
I so completely agree with the line that his unhappiness is his. I have been blamed for so much unhappiness, and I am not without fault, but I think the fact is that an unhappy person is going to be unhappy regardless of another. It's the same idea that another person cannot likewise make you happy.
I think it would all be much easier and simpler if his announcement of wanting a divorce was just to see your reaction and get affirmation. You clearly care and want to make things work. There wouldn't be such an impasse if this was all he needed to know. The issues are more deep-seated, but are probably mostly his own.
M: 26 W: 26 M: 1.5 T: 3 No kids BD: 31 March 2018
W's affair began: 23 March 2018 Affair confirmed: 18 April 2018 Confrontation/claims she ended A: 14 May 2018 Ended in-house separation: July 2018