Can I make a suggestion...
You may or may not be ready to separate but you could try and get some space. If he's drinking heavily at the weekend then he's not spending it with you. You may aswell spend time with friends, family. Get some perspective on it. Have a spa weekend away, just get away from his routine. I know it's not sustainable, but the rest of the week may be more bearable for you. It's NOT going to make him quit/taper. You have no power over him. (by him I mean the addiction -which is controlling him).
These are not your weekends, they're his. What do you want to do? What would make you happy? (ok..aside from flicking that big red stop switch that stops all of our loved ones drinking again)?
Big hugs, my love. I know how rough it is. We're all here for you.