Daniel's headline reads that he's "incapable of leaving well enough alone." He and Natasha sit next to each other on the train, and he feels as though she's slipping away. He wants her to take his hand so that she's the one acknowledging what they have. Daniel vows to let the issue go but then asks her what she's afraid of. Natasha insists to the reader that she hates pretense, but she pretends to not know what Daniel is talking about.
Relying on pretense and not being truthful is a surefire way to destroy the connection that Daniel and Natasha have developed. It's worth noting that Natasha's discomfort with the "real world" has to do with her impending immigration meeting, which shows again that those concerns overshadow this intimate connection.