Some things I meant to add.
I can understand a man feeling that he is not ready to be a father, or that fatherhood may negatively affect his relationship with his wife, or that it will involve a lot of hard work in order to be able to pay the bills, but I don't think that any husband should expect his wife to abort their unborn child - especially if mother & baby are both healthy.
Was he a happier, more attentive, man before the pregnancy?
Is it possible that he is suffering from depression, stress or exhaustion?