I understand that bonuses are supposed to be performance based compensation. But if this guy is claiming that he's consistently performant and has a great reput

I understand that bonuses are supposed to be performance based compensation. But if this guy is claiming that he's consistently performant and has a great reputation, maybe that portion of his compensation should have been moved from bonus to base. I can't blame him for leaving, but I also can't really sympathize with him for thinking any portion of the bonus was guaranteed.