Social Psychology Research

Abstract Introduction: Introduction: Marital instability has emerged as a significant contributor to the erosion of family foundations over the past three decades, often culminating in divorce. Understanding the factors associated with this issue is therefore critical. This study aimed to explore the moderating role of communication patterns in the relationship between romantic perfectionism and marital instability. 
Method: This correlational study employed structural equation modeling. The research population consisted of all married men and women in Gotvand County, Khuzestan Province, in 1401 (Iranian calendar year). A sample of 203 participants (129 women and 74 men) was selected using convenience sampling. Data were collected using the Christensen and Sullaway Communication Pattern Questionnaire (1991), the Edwards Marital Instability Questionnaire (1987), and the Matte and LaFontaine Romantic Perfectionism Questionnaire (2012). The data were analyzed at descriptive and inferential levels through structural equation modeling, path analysis, and multigroup analysis, utilizing SPSS-26 and SMART PLS software. 
Results: The results revealed that the communication patterns of mutual avoidance (β=0.145, p<0.001) and expectation/withdrawal (β=0.658, p<0.001), along with other-oriented romantic perfectionism, exhibited a significant positive relationship with marital instability. Conversely, the mutual constructive communication pattern (β=-0.345, p<0.001) and self-oriented romantic perfectionism showed a significant negative relationship with marital instability. Additionally, communication patterns were found to moderate the relationship between romantic perfectionism and marital instability. 
Conclusion: Overall, the findings suggest that communication patterns and romantic perfectionism are key factors influencing marital instability. Consequently, it is recommended that counselors and family psychologists offer targeted training to couples to address these dynamics effectively.