If you don't at least leave the house, he's not going to change as it'd be an empty threat. You need to weigh out whether you think separation (possibly legal separation) would be beneficial and spark him to realize you're serious or if he's just got that personality where he will do what he has to to get you back then go back to his old ways. Can you move in with parents or a friend until you can get something to get you on your feet?
Hi there. Sorry you are going through this. You must be really disappointed. I will say that I wish you'd stuck to your guns and just left when you caught him lying about it the first time. THAT would have been an ideal place to break it off.
He's obviously finding great value in weed or he is addicted. Neither of which is attractive to me either. I get where you are coming from. The problem is, unless you really take a drastic step, he will not think he never has to change this. Women whose partner cheat on them over and over often have a pattern of taking them back each time. Why would the cheater change? They are still there for them in the end. So, if this is a deal breaker, then act on it. Think about it . .. if it really is a deal breaker for you. Then act accordingly. He broke an agreement you had early on and something you've struggled with as a couple. This deserves some pretty major action.
Is he depressed by the way? Is he self medicating for something that it would be better to see the doctor to work on the root cause?
So, think about these things to figure out what your next step is. good luck
I think when women have some specific thing in mind that they state they WILL NOT TOLERATE, and then go on to marry someone who has that exact characteristic, it needs to be explored.
Your husband's drug habit aside, I think you need to explore within yourself why you married a man who you knew was doing the exact thing you said was a deal breaker. And then, while you were married you noticed he was still doing it but you did nothing and now that you're truly trapped - you have a baby and enormous debt and no job - it's suddenly actually become a deal breaker when it wasn't all along.
Relationships, and motivations for decisions aren't always what they seem. I don't think this is as simple as you are stating.