Single pregnant and father not around

I am 19 and 8months pregnant. I have been going through the same thing. My ex and I had been together on and off since my 9th grade year. I am now in my second year of college. Through this on and off relationship he had baby(not a reason we were on and off) Before i found out i was pregnant he would always talk about how we were meant-to-be together, that he loved me, and one day he would love for us to have a baby. Well a couple of weeks later i found out i was pregnant (wasn't trying to get pregnant). Well i told him and all of a sudden i stop hearing from him I would call and text all the time and got no reply this went on for about 3months. We eventually started talking again then the phone calls and text messages stopped AGAIN. Its been 5months since i have talked to him and i have tried everything to try and talk to him. I recently found out he have a girlfriend. The fact that he has a girlfriend doesn't bother me its the fact that he can't call to check and see how his baby is doing. And i really don't understand his reasons for doing what he's doing when he take care of his first baby. My due date is approaching soon and i have been going back and forth with myself on if i want him there for the delivery. He hasn't been here for me through the pregnancy should he be there for the delivery??? Someone please help me.!