In Act 1, Cassius is trying to persuade Brutus against Caesar. This would make him a betrayer. It shows that Cassius is against Caesar in all ways possible. Especially when he saved Caesar and he acted like a little sick girl. Cassius's persuasion eventually wins over Brutus and that's why the outcome of Julius Caesar, was what it was.
if they take pride in their reputation they dont wanna get caught cheating because it will ruin their reputation so it is very unlikely they will cheat
