Welcome, complicated1. Seconding what others have said about reading as much as you can on this forum. Educating yourself about alcoholism is going to be key for you. Don't miss the stickied posts at the top of the page. Here's a link to one you might find helpful.
http://www.soberrecovery.com/forums/...l-problem.html
If you've read much here, you will know that an A will only get worse, never better, unless he/she gets into some kind of recovery program. Simply stopping drinking usually doesn't fix the problem--the A has used alcohol to cope w/life for so long that they just don't have the skills to cope w/o it. That's why a program is necessary, so they can learn tools to deal w/day-to-day sober life.
Quite honestly, you are very new in this relationship. Maybe ask yourself what makes you want to sign up for this kind of ride? Four months in is new enough that both parties are still on their best behavior. How bad will it be in another 4 months? I know this isn't what you want to hear, but it IS something you should consider. How about letting him get sober (which he will do with or w/o you, if he is ready) and after a good solid year of sobriety, THEN see if you have what it takes to be a couple?
Again, he will get sober when HE is ready. And yes, of course he's afraid he can't do it. But as kindly as possible, YOU are not going to make a difference in whether he does it or not. This is all on him.
I'd also recommend finding an Alanon meeting--this is a great source of support and education also. Using SR and Alanon together works really well for many of us here; you might benefit from it too.
As you learn more, you'll see your path and you'll know what's right for you.