Girlfriend, it's time to get some more detachment happening.
You talk to him and he [censored] you back in ... then he lets you down again.
He's got a long way to go to make it through his journey - and you'll keep yourself and your kids safest if you just get out of his way while he's self destructing.
I know how much this hurts, but he can't help you right now - he's in a bad place. You have to look after you right now, and maybe for quite some time.