PLEASE HELP. I don't know what to do 😣😣

I'm 7 months pregnant with a guy I've been with for two years. I just found out he has a drug problem. And it's not marijuana, I think I could handle that better even though that's not good either. He's a good guy, goes to work 5-6 days a week, 10-12 hours a day. He pays majority of the bills cause he's the bread winner. He feels like it's ok for him to indulge in his habit at least once a week cause the bills are paid and I shop for our unborn daughter every chance I get. But I don't think it's ok. He's offered to take care of me while I'm out of work but I'm scared he'll change if he's the sole provider. I know he loves me but this is a big surprise to find out about someone and I don't know how to handle it. I need some serious advice... Please help