J.M.
If I were you I would begin protecting myself and my child. You need to cancel all of your credit cards. You need to talk with the bank and see how you can keep him from accessing funds and any other account that you have open. He can really bring you down and put you in serious debt if you don't protect yourself. You need to tell his family and yours about the problem and ask them for help. This problem has a way of escalting all on its own before you even know it has happened. The bets are going to get more frequent and the are going to be larger.
I have a very close friend that went through this and it nearly destroyed her. Her husband ended up leaving and she ended up having to pay back half of what he lost...credit card bill and loans.
Good Luck and get help!
J.