Neglectful fiancé-long-need advice 😭

My fiancé decided that me moving in with my mom in Arkansas and getting settled before he moved down would be a good idea. Begrudgingly I moved hoping that he was right. I found out two days before I moved that he was messaging another girl telling her that he missed her and wanted a family with her. I'm 3 months pregnant by the way... But me being the doormat that I am I basically let him get away with it. Ever since I left he's been distant and keeps ignoring me. He's on snap chat all day but won't reply to my texts or calls. He will send a text midday saying he loves me and some other stuff but will disappear in the middle of a conversation and I won't hear from him until the next day. I've loved him since we were 15, though we haven't always been "on". I have no idea what to do. He ignores every message I send telling him that we need to talk, and when we do talk he won't let me address the problems that we have. I have my doubts about him actually moving here. I'm dependent on him (emotionally) because of this baby. I don't want to be a single mom and I'll be honest, I've become needy ever since I moved here because he doesn't make time for me... I don't know what to do. I need advice please. Any comment welcomed 😢