Daughter with out a dad

Its a long way away before my daughter starts asking about her dad. But I don't know what to to tell her?
When I fell pregnant he told me he didn't want another child he had a son to another women and he didn't want him thinking dad was starting a new family. He was violent too. So he attacked me to try and make me miscarry as I wanted to keep my child.
I left as soon as I had a place and when the perfect opitunity came to get away.
Any way he had never made contact for custody when I was told he didn't want her at all it cut so deep. What father doesn't want there own child?? He found a new girl pretty much as soon as I left which just showed me even more he never loved me or our unborn child. This girl is more important than my daughter its so obvious and I hate her for it she doesnt care what he did and how he doesnt love his child. Can't she see how heartless he is?
So one day she is going to ask me the question I am dwelling. Mum why don't I have a dad. What do I say to her? Will she be okay growing up with out a dad?. I'm still single and have been since I left and never want to repartner again. Men scare me. Will she be okay not growing up with out a dad or with out a father figure?