Weed definitely isn't harmless when you let it rule your life. No judgement from me on either count; don't stay with a drug addict and your body is yours to control. I hope you don't feel guilty about either.
I'm not sure just how codependency works. It seems like drunks seem to find drunks and some people seem to wind up with users. Maybe it's the social circles we keep, I honestly don't know.
It sounds like making a clean break is the best thing, sad to say. If he resents you for the abortion, that resentment won't go away on its own. It will get worse and worse, and every little annoyance will become about that. Eventually all you will have left is contempt for each other. Let him find someone that will tolerate his using and work on yourself. You deserve to be happy.
Welcome to SR. I hope this place helps you to learn and grow.
