It worrys me like mad if my kids found what i had. Or it landed on the floor .
He should be worried about that.
He really does sound like he couldnt care less. But thats what it does to some people. He could be on more than you think. It makes you lie a hell of a lot.
The only things i can suggest are.. keep going as you are and bite your tongue.
Him wanting help and help him out, which he doesnt seem to want.
Tell him to at least cut down for now.
Or tell him if he doesnt change soon and stop you are leaving and you are going to start a fresh. But thats entirely up to you.
Ive seen so many stories on here how it effects women because there partners use , and have no intentions to stop and its not nice. He is obvioulsy thinking of number 1 , and maybe you should to!