LitCharts assigns a color and icon to each theme in The Sun is Also a Star, which you can use to track the themes throughout the work.
Immigration and the American Dream
Passion vs. Reason
Interconnectedness and Destiny
Isolation vs. Connection
Summary
Analysis
Natasha isn't sure how to feel. She checks her phone and finds a text from Bev: Bev loves Berkeley and thinks that the California boys are cute. Natasha tries to call, but Bev doesn't pick up. Natasha watches people enjoying their lunches and wonders how they can be so oblivious to the major changes happening in her life right now. She realizes she felt that way when her family got the deportation notice and when she discovered that Rob was cheating on her.
When Natasha feels that sense of disbelief that nobody knows what's going on, it's because she instinctively feels as though she is connected to other people. She can only acknowledge it, however, during periods of high emotion like this one.
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Themes
Natasha pulls out her phone again and dials Rob's phone number from memory. Surprisingly, he picks up and immediately informs her that what her "new dude" did earlier wasn't cool. She asks him why he cheated on her, and he begins to stammer, but she cuts him off. She assures him she just wants to know.
Here, Natasha briefly reconnects with Rob for the sake of closure, which will possibly push her closer to Daniel.
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Themes
Rob stumbles over his words but finally says that he didn't want to hurt either hers or Kelly's feelings, and he didn't want to choose one or the other. Natasha finds this wholly unsatisfying, and thinks that Daniel would never think like that. She asks Rob if he believes in true love, and Rob reminds her that neither of them do. Natasha isn't sure anymore. Before she hangs up, Rob apologizes, and Natasha tells him to not cheat on Kelly. Natasha thinks that she should call her parents, but she finds she wants to tell Daniel. She thinks she wants to believe in true love.
Indeed, Natasha is finally willing to admit she wants to have Daniel in her life only after she finds closure with Rob. This suggests that even if her connection with Rob was different and not nearly as strong or compelling as her relationship with Daniel is, it was still important in terms of how Natasha thinks about love and the influence of others on her belief in love.