I am having most of the same feelings you are having. Like your sitch, my H has been spending a lot more time with us and even sleeping over but then he detaches again. I know everyone says not to have any expectations but it is so difficult not to when they have given you positive signs. I don't know what to tell you but that you seem to be in a good frame of mind, you are doing great and keep doing what has been working. H is noticing otherwise he wouldn't want to be spending so much time with you.
Me47 H46 S13 M16 Piecing since May/09
"Life is 10% what happens to us and 90% how we react to it." Lou Holtz