Zed, It seems like you are on the right track. As others have mentioned, don't move out. In my sitch my WAW wanted to continue her EA (not physical that I know of). So, initially doing and saying all the wrong things, I was coming to the decision to move out. I didn't and she went ahead and signed a 6-month lease on a rental home.
I wish I could give you advice on feeling the voids where you didn't in the past, but similar to your W, mine noticed the changes and said pretty much the same things as your W.
Lastly, I'm not recommending snooping or questioning, but in my opinion its just hard for me to believe a young-aged couple ML 1-2 a year and now the WAW just wants to walk away and no EA of any sort is going on. That was just my opinion, but given how she's trying to push you out, IF an EA is going on I think she'll probably reveal it sooner or later..
Me:30 W:34 M:8 T:9 D:9 D:4 D:3 S:4 S:1 D bomb: 8/2014 S 12/2014 PA Confirmed in 3/2015 if I recall correctly