Help!!!!

I'm stuck in a horribley painful situation. I am expecting our first baby this December. My significant other and I are both addicts the only difference is I am in recovery and active in treatment. I just don't know what to do and if I will be able to get the courage to stand up for myself. When I tell him I'm not gonna deal with it he basically tells me I can leave and that's even more hurtful because then I feel like I'm in the wrong. I just want what's best for the baby.