My current situation

Just looking for advice or your opinions. 
So I'm currently six months pregnant. I was with the father for about six months and found out he was still seeing his ex. I broke up with him right away and about two or three weeks later I found out that I was pregnant. I did a pregnancy test (accompanied by my mom who happens to be my best friend ) and I decided to keep the baby (after a miscarriage that plunged me into a depression) when I told my ex he tried to force me to get an abortion and when I refused he threatened me by saying he would send someone to my house to kill my baby. After that whole situation, he ended up apologizing and blaming it on the sure use and stress that he was going through (at that time, he was playing in the NBA summer league and trying to secure a contract for the regular season) once that hard part passed, he seemed more open.. Asking about baby names and checking up on me periodically. then at that time the other woman sent me some messages asking about our relationship. I told her that I left him and that she could be with him without any problem from me ( I would never go back to a cheater) I also told her at that time that I was pregnant. She then called him and told him about our conversation. After that he totally changed and said he wants nothing to do with the baby or me. I assumed he was just mad again and would apologize and come around. He didn't. We haven't spoken since then ( about 5 months ago) I recently had to go see a genetic counsellor because my baby boy mesured large in his left atrium ( my OB said its a minor thing since he mesured 11mm and the norm is 10mm. Just to be sure they wanted to follow up and get our family history. I tried calling him numerous times to get the info and he declined all of my calls. Ive been trying to not stress about this but I just can't understand someone that couldn't care less about his sons health. All this because I didn't keep my pregnancy a secret. He is now overseas laying basketball in Europe and all I want is for him to be a dad. What am I going to do? 
Sorry for the never ending post but I had to get it out and I don't feel comfortable talking with people in my surroundings about it.. So embarrassing.