2by4, Of course you'd rather be in a better situation, but I read your first post and see a lot of hope for you. Your case seems similiar to mine. Three months ago, I thought my wife would walk out on me. We are still living together, and on the surface we are treating each other better than we have in a long time. Like your W, mine still says she is "missing that loving feeling for me" etc. I'm optimistic (yes I still have down days) that our relationship will turn around.
One piece of advice I received from the DB coach is to fill her love tank by speaking her love language. I think being that you're living together you also have the same opportunity. What's your W's love language? words of appreciation, touch, acts of service, gifts, or quality time? Identify it, and work on it.