Hi JB- You know what bothers me most about your story is not that he smoked weed, but his flippant response to you about it. After all he's put you through you'd think that, even if he believed all that stuff he's saying, that he'd stop out of respect for you.
Also the things he's saying like you're destroying the family and the kids will hate you - major manipulation. Very nasty.
I think you already know what you want to do.
Keep posting