Why did Pompey and Crassus wrong Caesar?

Interesting question. I wouldn't go as far to say that Crassus really wronged Caesar in any large way, as the First Triumvirate collapsed and civil war occurred after Crassus had been killed in Carrhae. Pompey, on the other hand, definitely wronged Caesar in many ways. read more

So yeah, while Crassus didn’t really wrong Caesar, as he was already dead due to his defeat at Carrhae some years prior to the Civil War, Pompey wronged Caesar out of personal jealousy and the desire to be accepted into the ranks of the Optimate faction. Hope this helps. read more

Likewise, in the Spartacus revolt, Crassus did the work, but after Pompey went in to (basically) mop up, he got the glory. This did not sit well with Crassus. He joined other opponents of Pompey in fear-mongering that Pompey would follow his former leader (Sulla) in leading troops into Rome to establish himself as military despot [Gruen]. read more

[28.1] Caesar had long ago decided that Pompey must be removed from his position of power; and Pompey, for that matter, had come to just the same decision about Caesar. Crassus, who had been watching their struggle, ready to take on the winner himself, had been killed in Parthia; so that now the field was clear. read more