If he was just admitted to the hospital, it does sound like he's too unstable to be in a relationship. It's possible that he's sending mixed signals because he doesn't know what he wants. That said, I can't read his mind (especially since I have never met him), so I can't know for sure what he's thinking. You have to take care of yourself though. It sounds like you may need to take a break from him until he's more stable.