Background: Marital infidelity is an interpersonal trauma that can lead to cognitive, emotional, and behavioral symptoms in the affected person. Objective: The goal of this study was to determine the effectiveness of emotion-focused couple therapy in insecure attachment styles in women and men affected by spousal infidelity. Methods: This study was quasi-experimental research with pre-test, post-test and follow-up with control group. The statistical population of this study included all men and women who were referred to counseling centers in Tehran in 2019-20 due to spousal infidelity. A total of 40 patients were randomly assigned to two groups: experimental and control, using a convenience sampling procedure. The intervention was not given to the control group. The Control group did not receive the intervention. Data were collected using an attachment styles questionnaire (Hazen & Shaver, 1987), and a multivariate covariance analysis test was used to eliminate the effect of pre-test using SPSS software. Results: The results demonstrated that emotion-focused couple therapy affected the scores of insecure attachment styles (P<0. 01). It was also revealed that the method of training was to enrich couples' relationships with an emotion-focused approach in the follow-up phase (P<0. 01). Conclusion: As evidenced by the results of this study, it can be stated that emotion-focused couple therapy is effective in women and men affected by spousal infidelity,therefore, it can be successfully used as a therapeutic or educational method in couple therapy programs.

Introduction: Regarding the importance of investigating the relationship between insecure attachment styles and Relationship Obsessive-Compulsive (ROC) symptoms, the present study aimed to predict ROC symptoms due to insecure attachment of the anxiety and avoidance type in the student population. Materials and Methods: In this descriptive and correlational research, the statistical population included all married students of Tehran universities in the academic year of 2022. The research instruments were the New Partner-Related Obsessive-Compulsive Symptoms Inventory (PROCSI), New Relationship Obsessive-Compulsive Inventory (ROCI), and Experiences in Close Relationships-Revised (ECR-R). After removing the incomplete questionnaires, the data related to 111 people (17 men and 94 women) were analyzed. Simultaneous correlation and regression methods were used to analyze the data. Results: Anxious and avoidant insecure attachment can predict significantly 27% of the variance of PROCSI scores (P= 0. 001). Anxious and avoidant insecure attachment can predict 29% of the variance of ROCI scores significantly (P= 0. 001). Avoidant and especially anxious insecure attachment in a meaningful model was able to predict the signs of obsession with the relationship with the spouse (P< 0. 01). Conclusion: Insecure attachment is important in creating Relationship Obsessive Compulsive Disorder (ROCD). We found a relationship between self-perception and others-perception and symptoms of ROCD.