Lucillius's revelation of Cassius's changing behavior heightens tension and hints at betrayal.
Lucillius explains that Cassius is far less friendly than he once was, and Brutus uses the information to confirm his judgment that Cassius is turning against him. In this passage, Lucillius's observation about Cassius's change in behavior contributes to the growing tension and conflict between the characters, specifically highlighting Cassius's possible betrayal of Brutus. This revelation serves to deepen the central theme of betrayal and loyalty in the play.
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