CO, there's a couple of things to think about here. One is whether you having got to the point where you were ready to become sober, you expect him to be that that point as well. It rarely happens that way. If it is going to happen it might take a while for him to work through all the barriers to sobriety, just as you probably thought about it for a period until you were ready. So he's obviously a bit upset that you expect him to be mentally in the same place as you.
The second point is that now you're sober you don't find drinking or drunkenness attractive any more. This is such a common reaction. I remember someone joking to me that her friends had become super boring now she was sober. I'm sure they felt the same about her. Drunk and sober don't mix well, and maybe you need to think about the long term future if you BF decides to keep drinking.