In the oasis complex, the thirsty man images he sees water, palm trees, and shade not because he has evidence for the belief, but because he has a need for it. Desperate needs bring about a hallucination of their solution: thirst hallucinates water, the need for love hallucinates a prince or princess. The oasis complex is never a complete delusion: the man in the desert does see something on the horizon. It is just that the palms have withered, the well is dry, and the place is infected with locusts.
Alain de BottonPerhaps because the origins of a certain kind of love lie in an impulse to escape ourselves and out weaknesses by an alliance with the beautiful and noble. But if the loved ones love us back, we are forced to return to ourselves, and are hence reminded of the things that had driven us into love in the first place. Perhaps it was not love we wanted after all, perhaps it was simply someone in whom to believe, but how can we continue to believe the the beloved now that they believe in us?
Alain de Botton