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This study investigated whether relationship satisfaction mediates the association between attachment styles and mate-retention strategies. Four-hundred and twenty individuals in a heterosexual committed relationship participated in this study (79.7% women; M age= 23.22, SD age= 8.07). Participants completed questionnaires assessing attachment styles, relationship satisfaction, and mate-retention strategies. The results replicated previous findings by showing that insecure attachment is positively associated with benefit-provisioning and cost-inflicting mate-retention strategies and extended previous research by showing that relationship satisfaction mediates these associations. The present findings confirm evolutionary predictions on romantic relationships that relationship satisfaction may serve as a monitor determining how individuals act to preserve their relationships.