Boyfriend relapsed.

I’ve had enough I’ve been dealing with it for the last year (he managed to get clean for 6 months) relapsed tonight but won’t admit it. We’re expecting a baby girl and now I have to face the reality of possibly being a single mom to 2. I can’t do it. 😭😭😭😭 I need help. I just got a new job I’m supposed to be at tomorrow morning at 7am (it’s currently 9:14pm) now I don’t want to go because i dont want to leave our son with him. How do you be a single mommy of 2?