I'm sorry for what brought you here. This is a new relationship. Sounds like it got pretty intense, pretty quickly. One thing to know, you, and this relationship, are in no way responsible for his drinking and hospital visit.
At this point, I'd suggest backing way off. Tell him you wish him well. There are a lot of people out there who are advised to not enter into relationships because they are too new in recovery and they ignore the advice and do it anyway. Honestly, if he's telling you that he doesn't want to be in a relationship, I'd take that at face value.
Hugs. It's tough. Maybe check out the family and friends forum for more support.