Daniel meets Natasha's eyes in their reflection in the train window, and he tells her that they're meant to be. His voice is bossier than he intended, and Natasha gets up to stand by the doors. She's obviously angry, and Daniel deliberates whether to apologize or demand what her problem is. When they reach their stop, Natasha darts out of the station and turns on Daniel. She hisses at him to not tell her what to feel and then storms away. Daniel doesn't really want to fight with her, especially right next to Central Park.
Daniel's mention that he doesn't want to fight next to Central Park shows that he believes there are some places that should be insulated from the world's issues, and the park is one of them. In reality, the park is as much a part of the city and a connecting force for residents as anything else.
Natasha crosses her arms and says that there’s no such thing as meant to be. She refuses to discuss the matter further. Daniel knows he's being unreasonable, but he persists. Natasha finally admits that she's an undocumented immigrant, and she's being deported. Daniel is stunned and can barely figure out what her words mean.
Though Daniel struggles to admit it, he finally experiences what Natasha has been experiencing all day: the crushing realization that his life and his connections can disappear in an instant due to one's immigration status.