Your husband is a big boy doing exactly what he wants and needs to do to ensure that his dis-ease is fed and maintained. Your responsibility should be to yourself and your children. You cannot cure his disease. But you can protect your kids from being infected by it. They do not have to grow up exposed to the disease of addiction. It's your choice. You can change things. Only you. Your husband is incapable. He has a selfish disease. He only cares about himself. He only cares about drugs.
The good news is you can get off crazy train anytime you want. There's lots of help available when you are ready to accept it. I decided I wanted a better life for me and my child. I did some self-examination and figure out what my motives were for staying and what I wanted out of life. You might want to try that.
Have you been to al-anon?