The mechanism through which self-blame operates within sexual relationships among individuals with a history of childhood maltreatment who develop disorganized schizophrenia remains poorly understood. This study aimed to explore how such misattribution operates within the psychological dynamics of an individual with a history of childhood maltreatment who developed disorganized schizophrenia. A qualitative approach with a single case study design was employed. The participant was a 48-year-old male with the initials F.C., diagnosed with F20.13 Hebephrenic Schizophrenia Episodic Remittent, undergoing inpatient treatment at Hospital X. Data were collected through systematic observation, semi-structured interviews, alloanamnesis, and medical record review, then analyzed using thematic analysis. Four major themes were identified: childhood maltreatment as the foundation of vulnerability, the formation of negative self-representation, sexual relationships and self-blame misattribution, and the accumulation of psychological pressure toward disorganized schizophrenia. Findings indicate that physical and emotional violence from the caregiver figure formed disorganized attachment, negative self-schema, and characterological self-blame, which manifested most concretely when the participant constructed a narrative of biological inadequacy to attribute his partner’s departure. Within the diathesis-stress framework, this misattribution served as the convergence point between childhood vulnerability and adult life stressors that accelerated the clinical trajectory toward disorganized schizophrenia. Mekanisme peran self-blame dalam relasi seksual pada individu dengan riwayat childhood maltreatment yang berkembang menjadi skizofrenia disorganisasi masih belum banyak dipahami. Penelitian ini bertujuan mengeksplorasi bagaimana misatribusi self-blame dalam relasi seksual beroperasi sebagai bagian dari dinamika psikologis individu dengan riwayat childhood maltreatment yang berkembang menjadi skizofrenia disorganisasi. Pendekatan kualitatif dengan desain studi kasus tunggal digunakan dalam penelitian ini. Partisipan adalah seorang laki-laki berinisial F.C., berusia 48 tahun, dengan diagnosis F20.13 Hebephrenic Schizophrenia Episodic Remittent. Data dikumpulkan melalui observasi sistematis, wawancara semi-terstruktur, alloanamnesa, dan telaah rekam medis, kemudian dianalisis menggunakan analisis tematik. Hasil penelitian mengidentifikasi empat tema utama: childhood maltreatment sebagai latar kerentanan, pembentukan representasi diri negatif, relasi seksual dan misatribusi self-blame, serta akumulasi tekanan psikologis menuju skizofrenia disorganisasi. Temuan menunjukkan bahwa kekerasan fisik dan emosional dari figur pengasuh membentuk disorganized attachment, negative self-schema, dan characterological self-blame yang termanifestasi paling nyata ketika partisipan mengonstruksi narasi ketidakmampuan biologis sebagai atribusi atas kepergian kekasihnya. Dalam kerangka model diathesis-stress, misatribusi ini menjadi titik konvergensi antara kerentanan masa kanak-kanak dan stresor kehidupan dewasa yang mempercepat perjalanan klinis menuju skizofrenia disorganisasi.