Marriages are supposed to last, but he's not married to you. He's married to his alcohol. If you gave him a choice between you and alcohol, what would he choose?
And your children, you need to protect them. This is not a good, happy or safe place for them. I am sorry you are going through this. I have been through it too. You can choose to live in this environment if you want, but your children cant and its not fair to them.