Keep working on you. You know what active addicts do and that is LIE!!!!!! He will say and do anything to keep what HE WANTS, and heck with what is best for you and the girls.
Please do what is best for you and your girls and the HE*L with him. You do not want to lose your girls and there is a chance it can happen if anyone finds out he is using. Would you be better off with him or without him. Not speaking of money but your mental health.
Take care of you and keep working on you. I am here if you need someone to talk to.
Hugs coming your way