Emotionally abusive relationship

Recently I've come to the realization that my boyfriend is emotionally abusive. I've known something was off for a while, but couldn't put a name to it until my best friend shared a website with me. I've been wanting to break up with him for a while, but I just can't bring myself to actually do it. I'm currently 18 weeks pregnant, and don't want my baby growing up in two different households but I know I can't keep living like this. I guess I'm just asking for advice from those of you who were in abusive relationships, and how you got out of them. Any kind words would be much appreciated, thanks in advance