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As to his drug use affecting the kids. You have a 9yo and a 11yo, they are old enough to realize that something is wrong with their father. They may not know what is effecting him but I bet they have some inclination that something with him is not right. If your kids do not know about the addiction know, i doubt you can hide it from them for too much longer. Do you want to continue to keep your kids in this situation? It's good that you're thinking of your children, but there comes a point when you have to think of what is best for ALL of you. If you feel you could do the following I would highly suggest it. Do not let him near the money, you are both in a bad financial situation and drugs are expensive!. Keep it under tight guard, if he needs money to buy something, YOU go out and buy what he needs or only give him enough money for what he needs and no more. If he can't get money then he can't get his drugs. You also need to force him to sit down and talk to you. He needs to start accepting responsibility for his actions. His drug usage is ruining your marriage and is helping to make your debt even worse! Tell him you love him but you cannot put up with his addiction anymore. Tell him If he will not take control of his actions and seek help for his addiction, you will be forced to leave because his drug usage is not a healthy environment for you or the children. You need to have a big heart to heart with him, if he doesn't listen, i would try and get friends and family involved and do an intervention.
There is no end to his addiction until he admits he has a problem and until he wants to seek help.