In the book, Gus has an ex-girlfriend, Caroline, who died of brain cancer. Hazel doesn't want to hurt him by dying the way that Caroline did, so she tries to keep her distance. (We all know now that works out.) In the movie, she is cut out entirely. Augustus's extended family, including his sisters and their "banker husbands," are also not featured in the film.
Gus's Ex-Girlfriend, Caroline
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