You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A 30 year old man has become suspicious that his wife is having an affair with his boss. He thinks his friend is also involved from abroad by providing support his friends tried to convince him but failed to do so. The patient is otherwise normal, doesn't have any hallucination or any other socially inappropriate behavior. The most likely diagnosis is and explain in detail?
Patient is having paranoid delusion, and absence of hallucination, socially inappropriate behavior rules out psychosis. The most likely diagnosis is Presistent Delusional Disorder.