Can't really add anymore to what the others have said..
I lived with an addict in active addiction for five years.. It was pure HELL and the longer I stayed the harder it was to leave.. Eventually staying got more painful then booting his ass out the door but even that was tough because the Codie in me thought i could still fix him...
I will NEVER EVER live with an addict in active addiction again and at this point in my life I don't think I could live with a recovering addict either ( no offense to my recovering friends here on SR, I'm just way to codependent to be in that type of relationship )
You must take care of yourself and your children.. your addict is going to do what he's going to do and he's going to say whatever it takes to keep you enabling him...