Pregnant and Single

I just turned 25 and am due on Nov 14 with my first child. My fiance and FOB left me at around 7 months pregnant. He is 30 years old and moved in with a 19 year old single mother after talking to her for a week. He met her at work.. where I met him and I knew her when I worked there and knew she was pregnant.  He has a 6 year old from a previous relationship that he has 50/50 custody of. He left me with all of the rent on our house and bills and has not paid me a dime of it or fixed a door he broke so I can get the security deposit back when he said he would. He has blamed me and put me down to justify his actions. He proposed to me 2 months before he left on a trip to Honduras we took with my family. He even asked my Dad. He left the same day he threw me a baby shower with both our families.. which got to meet for the first time. He has not bought one thing for the baby.. and just abandoned me.. and left me to find someone to rent the house... which has led to all of my savings being gone. He even called the police on me because he refused to talk to me when he left... about anything... I was hormonal and wasn't letting him leave without touching him. I guess I just wanted an explanation and some care about what I was to do. But he cowardly called the police... who let him go. I am working as a caregiver for the elderly until I can get back into school.. only I'm not able to get any hours right now being pregnant.. and cannot get another job right now. So I am living with my mother for when my daughter comes. Anyway.. we have had a fairly rocky relationship. I admit that I have not been the healthiest person. I had been bulimic since I was 17 and I could not kick it. I left nursing school because I couldn't get a handle on my bulimia and I had just met FOB. We lived together very soon after we met.. never really did the dating thing.. and were only together 9 months before I got pregnant. But I believe this baby is meant for a reason.. and I have healed myself and taken care of myself better than I ever thought possible from the moment I found out I was pregnant. And it was a great reason for him to grow up... and I was patient in asking him to do that. This was an unplanned pregnancy but I was ok with it and he was too... though he wanted to split up with me before we found out. So we tried to make it work... he wasn't all that into it. He didn't help me figure out how to get prenatal care, didn't come to appointments, and when he did he fell asleep. He complained about the ultrasound and just really seemed very let down that I was pregnant with a girl.. he obviously wanted a boy. I was completely miserable. He would yell at me for doing his laundry wrong, asking him to clean up after himself, and wanting to talk about our plans for how we were going to make this work. Fast forward... he ignored me for two months after he left... in the meantime.. I had developed a friendship with his ex.. and the mother of his child..who originally called to ask why her daughter had been so traumatized by not knowing what was going on when he left me. He had told me they were married but that never was the case. She filled me in on how much she hates dealing with him. He doesn't want to grow up. He wants to work overnight hours and use the 50/50 schedule to keep from having to get a real job and work real hours so that he can be a normal human being. He lied about many many things for which he blamed everyone else. He has blamed me for everything and continues to do so. When I asked him to help me with his part of the rent.. he said okay... and then never did. But he said.. you're lucky I'm even going to help you at all... though he never did.  His ex said he was the same with her when she was pregnant and that it was even worse when they had a baby. To me it seems like he is just the fun dad without responsibility with his 6 year old daughter. So just a couple of weeks ago he calls and says that he wants to come to my remaining doctor's appointments. I find out his ex called and told him he should be very ashamed of himself. I knew from the start he wasn't genuine but was willing to see what happened. He said.. 'you just needed some time to yourself'... I couldn't believe that.. Ya. That's exactly what I needed at 7 months pregnant...time alone to be lonely and scared. Anyway.. I let him come to one.. and I decided it wasn't doing me any good and that it was just a way for him to feel like less of an azzhole. So I told him the only way to see his daughter is to make it work with me.. since I need help with it.. financially and otherwise. He says he wants to be there for the baby when she comes.. but unfortunately he doesn't understand that he is already not there... and will not be the one up every two hours, changing diapers, stretching himself thin just to make it work... He is playing house with another girl and her son. I don't really want to continue to be hurt by this guy. I have tried everything to make it work out between us...before he left and after. I even paid for counseling.. which he came to two sessions of right before he left. I have given him countless opportunities to come back and make it right. But in my eyes he just chose an easy way out and is using this girl to not have to be there for me.  I don't think I want him in my daughter's life at all. I would love the child support from him.. but I think he would just go for joint custody to get back at me and it would break my heart to have him get my daughter. He fought really hard for his other daughter... for reasons I don't understand... to hurt his ex for leaving him (who left because he was the same with her) or for genuine reasons...I'm not sure. He is not a bad person...he just doesn't take responsibility for his life and refuses to grow up. He smokes week, which I hate. I really cared about him..and thought he would be so different. For the most part he is a good father to his daughter.. but he completely humiliated me and dropped all responsilbity to me and has left me to figure out how to make this work for me without any consideration... all without asking once even where I was living or if I was okay. I want him to suffer because I have been so depressed and miserable that some days I don't even want to get out of bed. And he is playing house and has a new girl to sleep with ..and is without a care in the world... it makes me so disgusted. I just don't know what to do... I would give him another chance... but I don't want to be walked all over. I am not having him there at the birth and so I don't know what to do about the BC. I live in Colorado and she is due any day now! I can't stop analyzing this mess of a situation and what to do... Please help me understand how I should react to this situation. I've tried so hard and am emotionally exhausted. I have blamed myself and been extremely down and have but a few friends... and I can't do that anymore.. for the baby... Please help and thank you so much! God bless u! Sorry it's so long!