Why did Louis de Broglie, Nobel laureate in physics, abandon his own pilot wave theory?

This week marks the centenary of the French physicist Louis de Broglie's doctoral thesis, which later earned him a Nobel prize for "his discovery of the wave nature of electrons." This discovery constitutes a central aspect of quantum mechanics, and it led to his famous "pilot wave" theory, which provides an alternative way to formulate the theory of quantum mechanics itself. However, de Broglie quickly denied his own theory. But for what reasons?