Why was cassius mean with caesar?

Question

Why was cassius mean with caesar?

Answer 1

Cassius envied Caesar.  They had started from about the same point--were the same age and came from similar backgrounds--but Caesar had risen beyond Cassius, who resented him but couldn't see (or accept) that Caesar simply had more of what today are sometimes called success factors in his personality.

Answer 2

He was jealous of him and wanted to take his power... that is why he had a lean and hungry look...