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:

Delusional disorder  

Explanation:

Delusional disorder is called a paranoid disorder. It a type of mental or psychological disorder. These types of people are in a sense that can differentiate between reality and illusion. Delusion is the main symptom of delusional disorder. There is an unshakable belief that isn't true or real. This disorder includes delusions that are not bizarre.  

Types of delusion:

i got 3,4 and 5 as an answer

answer; the edward snowden leaks of nsa classified material;