Robot

Gigolo Joe:
She loves what you do for her, as my customers love what it is I do for them.  But she does not love you, David; she cannot love you.  You are neither flesh nor blood.  You are not a dog, a cat, or a canary.  You were designed and built specific, like the rest of us.  And you are alone now only because they tired of you, or replaced you with a younger model, or were displeased with something you said, or broke.  They made us too smart, too quick, and too many.  We are suffering for the mistakes they made because when the end comes, all that will be left is us.  That's why they hate us, and that is why you must stay here, with me.