Psychological aggression is the most common manifestation of intimate partner violence. Literature demonstrates that attachment and jealousy can predict intimate partner violence. The aim of this study was to test a theoretical model in which jealousy is a mediator between attachment and psychological aggression. This is a quantitative study, with cross-sectional and explanatory design. A sample of 600 people, aged between 18 and 65 years old, residing in 13 Brazilian states, was investigated. A Sociodemographic data questionnaire, Psychological Aggression Sub-scales (CTS2), Questionnaire on the Affective Relationships (QAR), Interpersonal Jealousy Scale (IJC) and Adult Attachment Scale (AAS 2) were used. Structural equation modeling indicated that jealousy functioned as a mediator between attachment and psychological aggressions, alerting to the possibility of prevention in conjugality through early interventions.