Two studies examine whether specific cognitive tendencies and underlying personality traits inhibit the tendency to forgive and, in turn, decrease relationship satisfaction among emerging adults in committed romantic relationships (median relationship duration 1-2 years). In Study 1 (N = 355), trait forgiveness had a positive, direct association with later relationship satisfaction and mediated the effect of neuroticism on relationship satisfaction. In Study 2 (N = 354), forgiveness had a positive, direct association with relationship satisfaction and mediated the association between catastrophic rumination and relationship satisfaction. Forgiveness mediated changes in relationship satisfaction over time, with greater trait forgiveness predicting higher relationship satisfaction. Implications for research on forgiveness and for applied work on couple preventive interventions are discussed. (C) 2016 Elsevier Ltd. All rights reserved.