Inclusion Criteria:  have a cohabiting partner or spouse and both spouses must commit to staying in the relationship through 15 sessions of CBCT for PTSD have a current diagnosis of PTSD based on Diagnostic and Statistical Manual of Mental Disorders (5th Edition [DSM-5]; [2]), assessed with the Clinician Administered PTSD Scale for DSM-5 (CAPS-5;80) not participate in concurrent psychotherapies directly targeting PTSD (e.g., eye movement desensitization and reprocessing; present centered therapy; PE) or concurrent couples therapy  Exclusion Criteria:  unmanaged active psychosis or manic episode (assessed with Yale University PRIME Screening Test) substance use disorder warranting primary substance use treatment or detoxification (assessed with AUDIT;109 and DAST-10;110]) Imminent suicidal risk (assessed with Paykel questionnaire;111) severe physical, verbal or cyber aggression currently or in the past 3 months (assessed with CARS;112 and CTS-2;84) a current PTSD diagnosis for both spouses (assessed with CAPS-5;80).