You can't get him to understand anything.
What you can do though is get yourself to some Alanon meetings and continue coming to this board so that you can learn what alcoholism is and figure out if you want to and can deal with it before if and when you decide to have kids with this man.
Alcoholism is not something you outgrow it is a progressive illness and the only one who can seek help for it is your husband and he has to think he has a problem first.
Take care of you.
Ngaire