How does Timon of Athens lose faith in mankind?

Timon, lord of Athens, is so generous he gives his great wealth to anyone who, seemingly in need and flattering him, asks for it. He does this for such a long time and in such a great degree that he himself is finally reduced to poverty. Asking the many people, now rich, whom he had helped to now come to his aid, he is again and again turned away. No one whom he helped will now help him; they shun him.