Of course he would need to pay child support he helped make them. That is the absolute least he could do. He needs to also help raise them. When you file for divorce you need to ask him if he wants joint custody or not. IF he says joint to make his bills lower then make sure he takes them when he is supposed to and give yourself a break. IF he doesn't take him back to court for modified support / custody arrangements.In terms of the financial situation, I would have to put him on child support because I wouldn't be able to survive on my income alone. Its a tough situation.
Like I told him it took both of us to have our children. Therefore, it takes both of us to raise them. Unfortunately he doesn't see it this way.
He isn't going to change most likely. Have you asked him to not go out with his friends and watch the children?