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In chapter 19, Leo is asked who's affection he values more: Stargirl's or the other student's at the school. The answer is he values the other student's more. The book does not explicitly state this. How do we then know that he values the other student's affection more?
The end of the chapter states that Leo knew the answer to this question, but that he did not want to admit it, which implies that it is a bad answer. Choosing Stargirl would not be bad because she always cares about Leo, whereas the other students have shown that they do not always care about him.