was that upon hearing about the incident that happened in the apartment he immediately started to become fascinated by it. He goes to visit her in the hospital and befriends one of her good friends. And the more time he spends in the apartment itself he begins to become her in a sense. The ending, I just take that to mean that he has fully turned himself into her. I don't think that was him at the beginning at all. I think it was in fact the real Simone. But he is now "her" in his mind so his actions imitated hers, and he pictures himself standing beside his own hospital bed.