A person acts extremely jealous all the time and complains bitterly whenever other people appear to be getting more attention. This has been going on for a couple of months, and the person shows no other substantial symptoms. The BEST diagnosis, assuming the extreme jealousy has no basis in fact, is:

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Delusional disorder is characterized by the presence of one or more delusions for a duration of one month or longer. Extreme jealousy without basis in fact can be considered a type of delusion, specifically a delusional disorder of the jealous type. Unlike paranoid schizophrenia, it does not typically involve a broad range of psychotic symptoms, and unlike schizophreniform disorder and brief psychotic disorder, it does not imply a shorter duration of symptoms or a broader range of psychotic features.

A Person Acts Extremely Jealous All the Time and Complains