Answer:
Jeff Probst notes his mind came up blank, and it was actually producer Mark Burnett who came up with “the tribe has spoken,” but it was somewhat of an accident. Burnett told Probst, “Jeff, I don't know what to say, the tribe has spoken, that's just how it goes.”
But in direct answer to your question, it was 'Survivor'
Hope this helps :)
Reports say that he had no mental illnesses or anything he was just obsessed with her...