In the play Julius Caesar by William Shakespeare, what mistaken assumptions lead to Cassius’s death?

In Act V, Scene 3, Cassius makes several false assumptions
that lead to his death.  While he is in the mountains with his friend Titinius and
servant Pindarus, they look down at his army's camp and see a fire.  Cassius wrongly
assumes Antony's men have overtaken his camp and set it on fire.  Still,  he sends
Titinius to see if this is in fact the case.  Since Cassius has poor eyesight, he asks
Pindarus to tell him what is happening to Titinius.  Pindarus wrongly assumes Titinius
has been taken prisoner by the enemy army.  Feeling that his cause is lost and depressed
because he sent his good friend off to his likely death, he orders Pindarus to stab him
to death.  Pindarus obeys and is now a free man.  However, Cassius lays dead because he
jumped to conclusions and made assumptions instead of first finding out what really
happened.