He is not the first to feel the stag of betrayal at the hand of a trusted friend:
For Brutus, as you know, was Caesar’s angel.
Judge, O you gods, how dearly Caesar lov’d him!
This was the most unkindest cut of all;
For when the noble Caesar saw him stab,
Ingratitude, more strong than traitors’ arms,
Quite vanquish’d him: then burst his mighty
heart. . . .
Julius Caesar Act 3, scene 2, 181–186