Sexual jealousy is an evolved emotion that serves a mate-guarding function and is activated under specific conditions, such as threats to a relationship.

“contrary to what most psychologists have argued over over the history of psychology that it's a pathology, it's a sign of immaturity, it's a neurosis, it's a psychosis, it's a delusion. But that jealousy, sexual jealousy evolved for a mate-guarding function.”