How to deal with baby's father's controlling ways?

I am in need of advice ladies. I am currently 6 mnths pregnant and my baby's father left me for another girl after we had 4 years of a relationship. After we broke up he was denying the baby at first but now he claims him. We argue all the time cause he always calls me out my name, says how much of a bad girlfriend i was, and also on how he dont do anything for my son. He is currently living with the girl and just told me last week that she is also pregnant with his baby. My thing is everytime we are together he takes my cell phone and goes through it, always try to see where im going and who am i going to be with, and always asking me for money. I always ask him why is he doing this his excuse is because i have his son and is also pregnant with his child. I just dont understand if he dont love me and hate me as much as he says he do y do he always throw it up in my face or always calling my dude friends in my phone, he even went as far as to bashing me to the guy i was currently dating on facebook. WHAT CAN I DO?