How should I take this situation?

Ok I know I have for advice in here before but something different happened. My ex pregnant gf who is 17 weeks pregnant who I dated 5 months before she broke up with me because she said once she got pregnant couldn't feel forever with me. Well yesterday she heard of a girl trying to get with me and asked me about it and started calling the girl a whore and was mad at me about it. I didn't hook up with the girl I told the girl Im not giving up on my ex pregnant girlfriend but still my ex was mad. I'm just lost because she said she doesn't care for me but then gets upset on stuff like that and just acts like she wants to talk to me then turns around and hates me. Any ideas on this.