Gerta suspects that her husband is being unfaithful. She goes to great lengths to find support for her jealous beliefs despite that there is no evidence to show that he is cheating. Her husband cannot do anything to quell her jealous beliefs. Gerta's pathological jealousy is probably related to personality disorder.

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Gerta's behavior is consistent with paranoid personality disorder, which is characterized by suspiciousness, a tendency to interpret others' behavior as threatening, and an inability to trust others. People with this disorder often develop unfounded suspicions about the loyalty of their partners, even in the absence of any evidence.

Gerta Suspects That Her Husband Is Being Unfaithful