Hello Petat and Welcome!
I am just so sorry you find yourself in this position. I am glad you are seeking help for yourself and your children, as that is where your energy can do the most good right now. Your husband has resources, knows what they are and how to use them if and when he decides to do so.
*Is it worth it?* That is a question only you can decide. I will never tell you what you should or should not do. You will get a lot of information and support here whatever you decide.
*Why does he do this?* Because he is an alcoholic. It is an internal battle that only he can wage using all of those tools. He will get sober only if and when he decides that sobriety is the most important thing. Both active addiction and early recovery are very selfish times for the addicted person. I hope that when he finally decides that sobriety is what he truly wants, he will grab hold of it with both hands and not let go. But that is up to him.
I hope you will take good care of yourself and your children!