It sounds like you have a solid relationship.....and he will be glad that he has that....no reason for you to give up a good thing...those are hard to find.
He will be going to get support from other alcoholics..it just needs to be that way.
I also suggest al-anon so that you can learn your role in this.
Please feel welcome here....there are alot of good stickies with info at the top of this forum.
It tends to be a bit slow on the weekends around here....I am sure many others have helpful insghts.