Let us focus on what precisely is going on here. We are privileged observers of a terrifying conversation that is going on between a man and his partner, who is pregnant with his child. As we carry on listening, we can see that the man wants Jig, his partner, to have an abortion. She does not want one. He exerts every kind of psychological pressure on her to try and persuade her and to force her to do this, including threatening to end the relationship if she doesn't. If she does have this abortion, however, he promises that everything will return to the way it was before in their relationship: "We'll be fine afterward. Just like we were before."
The section you have highlighted comes towards the end of the story, when it becomes clear that the battle has been one and Jig sees that there is no way out of this for her. Jig seems to realise that their relationship is heading for an unhappy finish, and that having an abortion will only speed this process along. Note what she says and the dialogue she has with her partner:
"I said we can have everything."
"We can have everything."
"No, we can't."
"We can have the whole world."
"No, we can't."
"We can go everywhere."
"No, we can't. It isn't ours any more."
"No, it isn't. And once they take it away, you never get it back."
Jig seems to be almost deliberately confusing the baby inside of her with the future hope of their relationship, as she replies in a series of negative responses to the encouraging and soothing phrases of her partner. She seems to recognise the awful finality of abortion and the way that you can never go back from that, just as in the same way this step will have massive ramifications for their relationship.