It may be that your friend doesn't really know how to support you, but I'm pretty much with the others here on this one. I have good friends who will openly admit to loving alcohol but in the early days when I had cravings if I would so much as admit to thinking it would be nice to drink, they would give me a quick and immediate NO - YOU'RE NOT DOING THAT.
If you value the friendship it may be best for you to have a conversation about the importance of what you're doing and what kind of support you want from your friends. If that doesn't work then you may have to distance yourself.