Why is my ex such an a**?

So long story short the doctor thought I had cervical cancer, & I forgot to take my birth control pills, well I ended up not having cancer when I went to get checked, just to find out I'm pregnant, well me & him got in a huge fight & when he went to he's friends I ghosted him cause he threatned to make me have an abortion, I moved in with my sis & he hit me up a week later, we messed around a few more times, until we got into it again, we haven't spoke in 3 weeks now, then I moved in with my mom, its not working out here either, so I'm gonna move in with my grandma, until I can find my own place, but not once has he checked on me or the baby to see if we are ok, & he's prob out screwing alot of women now that he's single, I wasted 2 yrs on a mf that I was nothing but good too, why does he gotta be such an a** & he cares more about he's stupid friends & parents think