fuzz,
Like practically all posts of this type its mainly about the alcoholic. It also needs to be about you as well and your roles being played out in his alcoholism.
Alcoholism thrives on secrecy and is truly a family disease, he is not the only one here affected by it. You are also deeply affected by his alcoholism and you are playing out the usual roles (enabler and provoker) associated with same. Life with an alcoholic basically consists of lurching from one crisis to another.
You need to get off the merry go around that is alcoholism.
The 3cs re alcoholism:-
You did not cause this
You cannot control this
You cannot cure this
You were 19 when you met this alcoholic and you have spent 8 years with him. What sort of a life do you have with him now. Do you want marriage and or children, he will not be able to give you either.
He started drinking at 15 and likely had alcohol dependency issues from the early days as well. What do you know about his own family background?. I ask that as alcoholism can also be learnt from family members.
What do you get out of this relationship, what is keeping you with this drunkard?. Your own co-dependency issues?. Did your parents drink too much?.
The only person who can help him is him and he is showing no signs of wanting to give up alcohol. He wants you to help him quit and no you cannot do that because he will bargain and blame you for his failures. You need to detach from him. His primary relationship is with drink, its not with you and you will waste many more years on him if you stay.
You are way too close and over invested to be of any help to him, not that he wants your help anyway. He will also find it almost impossible to quit drinking without professional support. Like many alcoholics he is in denial and thinks he can stop on his own. He is also likely to be badly underestimating just how much he is drinking. You can only help your own self and one step in that process is to go to Al-anon meetings. They are very helpful to family members or people affected by another's drinking problem.
You are also co-dependent, many such dysfunctional relationships often have co-dependency as well in it. You use each other as a crutch and he blames you for his failures.
If you really do love this man you would now walk away from him for his sake as well as your own.
Do read "Codependent No More" written by Melodie Beattie and contact Al-anon. At the very least read their literature.
Your own recovery from his alcoholism will only properly start when you and he are not together any more. Am sorry to be that blunt but that is the way it is.