schizophrenic love..

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guys do you believe in imaginery love..let me explain..i mean a perso n who is schizophrenic and hallucinates about someone and falls deeply in love with that person. a movie based on it is 15 park avenue. can anyone clear my doubts that how can this be possible that a person is falling in love with a person who never existed and keeps on talking to that person? can this happen to anyone? what are the causes???