I can see why you are so upset
..if you are over there so much it wouldn't make sense *not* to have at least some drawers set aside just for you to use.
At least a small set of drawers or *something*!
Remembering back to when I stayed with my dh while he still lived at home..I think he just somehow made some space for me to have a couple drawers and some closet space. I would have gone nuts without that! (his room didn't have space for a whole dresser ..as it was the dresser was in the closet)
Tell him if he doesn't want a roommate then you wont be spending the night with him either

That is ..until you get some space for your own things!