Im 17 & i thought the babys dad had finally changed..?

i'm 2 1/2 months pregnant and the babys dad is so violet he was so horrible at the begining of the pregnancy and then all of a sudden he said he wanted to be a dad and was going to be there for me, he was looking at flats for me to move into near his family home so i could get the support from them as my parents blame me for him acting like he does to me and dont want me at home. I have just moved into a flat about 20minutes away from his house which my grandad paid for, as i didnt want the babys dad to have that hold over me, the other day we were out at a midwife appointment and then when we got back to my flat he started saying that i was making a big mistake keeping the baby as i couldn't cope when the baby finally comes, i told him if he didn't want to be apart of it then to leave now, he walked out the door and then a few hours lateer i received text messages off him telling me i would lose the baby i didnt deserve to have the baby, and that he wants dna testing done, and that he would make sure that i dont have a happy ending, so i told him if he didnt wanna be in the babys life to leave for good now because i cant keep letting him have a last chance. what can i do? he says he doesnt care then he does care, i'm so confused and my family dont care or want to help me... please i just need some advise on what to do