Loneliness as a Fracture of Belonging

This article develops a comprehensive theory of loneliness grounded in the Psychology of Belonging developed by Carlos Federico Obregón Díaz. Against approaches that conceptualize loneliness merely as an affective state, a depressive symptom, a deficit in social skills, or a consequence of insecure attachment, the paper argues that loneliness is fundamentally the psychological expression of fractured belonging. The article introduces the ontological thesis that the human being is primarily a being-who-belongs, and that the self is constituted through networks of affective, social, institutional, and existential belonging. Within this framework, loneliness emerges not simply from isolation but from the deterioration, absence, instability, or distortion of meaningful structures of belonging. The manuscript reconstructs the central concepts of the Psychology of Belonging, including: the instinct to belong, the triadic structure of belonging (to loved ones, society, and the universe), the emotional self, and the self as a narrative history of internalized belongings. A major contribution of the paper is the distinction between: structural loneliness, generated by failures in family, economic, social, and institutional belonging; and existential loneliness, arising from awareness of finitude, individuality, and mortality. The article systematically compares the Psychology of Belonging with behaviorism, psychoanalysis and attachment theories, humanistic psychology, cognitive-behavioral approaches, and social psychology. It also contrasts the framework with contemporary scientific theories of loneliness developed by John Cacioppo, Louise Hawkley, Julianne Holt-Lunstad, and Robert Weiss. The paper argues that existing theories frequently reduce loneliness to intrapsychic, cognitive, or interpersonal processes while neglecting the institutional and structural organization of belonging. In contrast, the Psychology of Belonging integrates neurobiology, psychology, ethics, institutions, and social organization within a unified model centered on belonging/non-belonging. Clinical implications include: diagnosis of belongings, work with the emotional self, narrative reconstruction of belonging histories, and the creation of new affective, social, and institutional networks. At the socio-institutional level, the article proposes that chronic loneliness reflects failures in economic, educational, labor, urban, and cultural structures, transforming loneliness from a private pathology into a diagnostic indicator of the quality of social organization itself. The work contributes to contemporary debates in loneliness studies, clinical psychology, philosophy of psychology, attachment theory, social neuroscience, and social theory by proposing a multilevel ontological and institutional reconstruction of loneliness centered on belonging.