LONG advice please...

I'm 38 weeks pregnant. My boyfriend was a recovering drug addict. His doc was meth. He overdosed in September on the day we found out the gender of our baby. He had a seizure on my parents living room floor. I lost all trust in him. But he went to rehab for a while and I thought things were getting better. However today, in the middle of my baby shower, I find out he's using again. I knew he had been acting weird but every time I'd mention it he would tell me I'm crazy. I packed all my stuff and left to my parents. Now his step sister is saying horrible things to me. She also uses meth. And heroin. I told her to leave me alone and that I'd be calling CPS since her children are exposed to those hard drugs. I don't understand. I have tried to help my boyfriend get sober for 2 years now. But this was the last straw. Our daughter is going to be born so soon. I walked out of my baby shower. I completely fell apart. I know most of you will say I was wrong for that. I just need some words of encouragement right now. I've been depressed my whole pregnancy because of his drug use. But after today I can't help but wish I were dead. I'm not going to harm myself as I'm pregnant and wouldn't want to hurt my baby...but I have been thinking about it tonight. Somehow I'm the bad person. I try to get him to therapy every week. I encourage him not to talk to other drug users (like his sisters) but I guess everyone thinks I'm psycho and controlling. Maybe they are right. I've been being told it for 2 years now...I sometimes believe that everyone is right about me. These are some of the messages from his step sister. I crossed out all names.