Needs some S/O advice..

Ok so we've been together for about a year. We currently live together and about 2 months ago I found out he was sexting another woman. I want to work things out for the sake of our daughter. We've talked about things and so far we don't really get past it, or I can't at least. He's a disabled veteran and smokes weed almost every chance he can get to help with his pain and ptsd. When I ask him for help around the apartment, he says he will, but then never does. I'm starting to become really big and uncomfortable being that I'm 33 weeks pregnant now. I don't have much for the baby other than a few outfits and a car seat. Our lease is up November 1st and I've already asked him to help me look for a new place for us, but again, it hasn't been done.