Should you leave your spouse if he has been using drugs and you have children and have tried to get him to seek help?
Your children come first and one of their parents has to be responsible. If you have parents, relatives or friends you can stay with please do. It is obvious your spouse has chosen the drugs over you and the children. By staying you will be nothing more than an enabler of his addiction. Leave, then see what he does. If he is serious do not go back until you are sure he is on a good program for drug abuse and even at that just be there for support and leave the children out of it. I think you already knew the answer to this one.