Good Evening,

do you by any chance speak Bulgarian? I could reply in that language if you wish (or in English) Please advise.

Depending on the age of your father (if he is a first generation Bulgarian who had relocated to another country) he may be quite resistant to going to a psychiatrist. The reason for this is the stigma attached to the field of psychiatry and mental health during the communist regime that ended in 1989. Even now in Bulgaria, mental health is not very popular as a field or treatment modality.

If your father is not Bulgarian, similar difficulties may arise simply due to the fact that if he had not sought mental health services before, the novelty of it is anxiety provoking to everyone.

One way to approach this is to introduce the concept to him in small steps over a period of let's say several days. Initially just mention that you have notices his behavior having changed and that you are concerned since, there had not been any evidence.

Try to find out if he has suspiciousness about other people and other areas. If the though process is underlined by paranoia, there would be other areas versus just suspicion of her being unfaithful.

Then, you could suggest that perhaps he ought to speak to someone else to see what they may say about what he is experiencing and get an objective view.

If he is resistant, inquire if it would be best that he goes alone to the doctors appointment, or wishes to bring another family member for support and their contribution and objective concern and observation report.