What moral dilemma does this excerpt express?

O Titinius feels guilty that Cassius is dead, and decides he must kill himself
O Brutus feels guilty that Cassius is dead, and decides to give him a garland
O Messala has to decide whether to tell Brutus about Cassius or to kill Pindarus
O Titinius has to decide whether to tell Brutus about Cassius or to kill Pindarus