Michigan State University Apr 3 2026 New research from Michigan State University challenges the popular assumption that narcissists gradually damage their relationships over time. The study used longitudinal data to track over 5,000 couples for up to six years. Participants completed questionnaires that measured two dimensions of narcissism: narcissistic admiration and narcissistic rivalry. Narcissists have two different ways to maintain their inflated positive self-perceptions. They can puff