"I'm not so sure you'll be a good parent
Yes because being a drug addict is the perfect role model for a good parent.
I commend you on sticking with him and supporting him through what can only assume to be a very difficult stage.
Unfortunately, I believe it would now be time for him to focus on restructuring and reforming his life in order to be a solid foundation in his child's life rather than having someone do it for him.
I'm on the bandwagon with Tal, he needs to sort his life out with the space and support he needs. You need to take this experience of life and restablish yourself on a new and productive path.
I honestly, don't see him making a lifetime commitment to you. He's yet to settle the demons on the inside before he can focus on forging a new life with you.