Just want to add my support and friendship, Mutatio. I am learning from you and from all the wonderful advice you are getting. Stay strong.
Sadly, I think it is these feelings of detachment that are our best chance of losing our spouses, and also our best chances of getting them back. You know the whole concept of the left behind spouse becoming the walk away? I think that happens a lot. Not to say you would do that, but at some point, you don't know what is in your future.
Stay strong. Is there something you can do for fun today, something just for you? Maybe for S too, that would count I think.