Based on the passage, the two options that best reflect the changes in the interactions between characters are:
The conflict between Cassius and others is becoming strained.
Brutus says Cassius is pretending to be friendly.
In the passage, Lucillius describes his recent interaction with Cassius, stating that while Cassius was courteous and respectful, their conversation lacked the familiarity and friendliness that was present in their previous encounters. Brutus interprets this change in Cassius' behavior as a sign of his friendship cooling and suggests that when love or friendship starts to decay, people often put on a forced facade of politeness. This implies that there is a growing conflict between Cassius and others, including Brutus, which is straining their relationship. Additionally, Brutus suspects that Cassius is pretending to be friendly, indicating a lack of trust between them.