Should i keep baby on the way (3wks) since crazy boyfriend skipped out on me?

Im a mother of a 20 mo. old son, I have been in a loving relationship (or i thought) for 6 months now, 2 weeks ago he almost asked to marry me, @ that point he decided to move in w/me, after 2 weeks of living w/me & a temporary sister move in, when i tell him im pregnant, he gets all of his things and leaves. Yes he wanted a baby, yes it got weird after i told him the news, he says he still wants to be with me, but now hasnt called, texted, NOTHING (he is 30, I am 23.) I am heartbroken, he says its not the sister move in, or the baby, but a gut instinct telling him "dont move in" keep in mind, everythings been great! Now i cant decide what to do with this child. I have had 2 abortions before & emotionally i cant take it. I know ill be having to do this pregnancy on my own & still put up with his crazy personality. My gut is telling me to get him out of my life & terminate; the other motherly side is to keep it. He is against it as well as a lot of you. Im thinkin it something else! Hel