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Her astonishment, however, was extreme, and continually was she repeating, "Why is he so altered? From what can it proceed? It cannot be for me– it cannot be for my sake that his manners are thus softened. My reproofs at Hunsford could not work such a change as this. It is impossible that he should still love me." (43.60)
Elizabeth doubts Darcy's love for her, or that her angry words could have caused this change in his behavior. Of course, her doubts are later proved wrong, showing us that Elizabeth's judgment isn't always accurate.