The purpose of this study was to evaluate Gestalt therapy theory by exploring the causal model of contact-interruption, unfinished business, and psychological well-being using the structural equation modeling analysis. Participants were 434 seventh- and eighth-grade students, with 239 males and 195 females. The overall goodness of fit indices and most of the internal and external goodness of fit indices indicated an appropriate fit with the revised theoretical model. Finally, recommendations for further research were suggested, including clarifying the types of contact-interruption, dealing with the conflicting nature of autonomy and positive interpersonal relationship, and comparing causal models for males and females.