the best way to love him........
is to take care of yourself, and to set limits on what kind of behavior he must show when he is with you.
That not just my opinion, that's the advice I got from a recovered alcoholic, someone who understands both sides of the situation.
Sometimes love has to be tough.
You can't make him want to change, and you can't help or "support" him to change. He has to do it on his own, or it won't work.
The only thing you can do is to set standards for what is acceptable, and STICK to the standards, even if it isn't what you feel like doing at the time. Even if it hurts you to push him away.
Refusing to live with the alcohol doesn't mean you hate him, it means you love him.