Need Advise about a delicate issue!?

I just recently found out that I'm pregnant from my ex boyfriend who completly did a 360 in his personallity. He was very sweet and carrying one day broke up with me and complety acted like a jerk and made me feel so horrible about myself. I felt so bad and stupid at the same time because he was not a typical guy I woyuld date but I looked over thatt and he won be with his personality. (that's our background history just for your fyi). Well I just found out that I am pregant i tought the right thing to do was to tell him. His reaction was cruel and cold he said he can't be there and I have to have an abortion. He is now been trying to get a hold of me but honestly i dont want to deal with him, it hurts me to hear him specially his negativity I don't need that right know. Any advise on what to tell him, I mean eventually i need to answer the phone what can i tell him to give him guilt. I'm scared of him and my brain goals completly blank.