Hi and WELCOME to SR. This place is awesome for finding support. I hope you keep coming back.
First off, let me repost the 3 C's of addiction that lexiecat mentioned:
You didn't CAUSE the drinking
You can't CONTROL the drinking
You can't CURE the drinking
It's an illusion to believe that you have the power to change him and his addiction. Only he can do that, and only if he darn well wants to.
Regarding what's next...don't focus on what you're "supposed to" do....this is about what is best for you. Trust your already awesome instinct: you felt the need for space. Go with that. Give No Contact a try and see what comes of it for you.
Most of us come to SR looking for answers about our loved ones, thinking that if we could just convince them of x,y,z, our relationships would magically be better. After a time, it becomes obvious that the issue here is OURSELVES and how we relate to others. So we begin our journey of recovery alongside, but most of the time independently from that of our loved ones.
Definitely look into Al-Anon...and keep coming back to SR. We're always here.