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Caesar claims that Cassius is untrustworthy because he has an evil look to him, he reads too much, observes too well, hates going to plays, doesn't like music, doesn't smile and when he does manage to sneak a smile Caesar believes Cassius is thinking evil thoughts. </span>
I'm just guessing from my observations from the book. I only read it once and it was a long time ago. I think the answer would be no. I think what the novel reveal about real enemies is anybody who comes into power and uses that power selfishly. But if you want a better answer I suggest you go on Sparknotes.
Tho she gets angry at tom, she truly loves him
The answer would be Operational exhaustion. Hope it helps!