Becky cries at Jos’s letter because she knows it’s time to leave, and he has run out of time to propose to her. While Becky succeeded in charming the whole Sedley family fairly quickly, she also managed to lose much of this goodwill just as easily, a pattern of behavior that will follow Becky throughout the rest of the novel. Becky ends her visit with the Sedleys less naïve than she was at the beginning—she correctly guesses that George was the one who interfered in her potential marriage, although it’s also unclear how serious Jos himself was about proposing to Becky in the first place.