Why is Robbie so weird in Victorious?

Why is Robbie so weird in Victorious? In the episode, Robbie does not understand why he was referred to as a “ventriloquist”, which either jokingly indicates that Rex has a mind of his own and is not controlled by Robbie at all or (in a more serious matter) that Robbie suffers from schizophrenia, therefore considering Rex a real person.

In the episode, Robbie does not understand why he was referred to as a “ventriloquist”, which either jokingly indicates that Rex has a mind of his own and is not controlled by Robbie at all or (in a more serious matter) that Robbie suffers from schizophrenia, therefore considering Rex a real person.
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