Previous research has found that some people suppress their emotions when making a sacrifice for their relationship partner-and that this can reduce relationship satisfaction. We suggest that trust in one's partner determines who suppresses their emotions during a sacrifice. We hypothesize that individuals with low, compared to high, trust in their partners will be more likely to suppress their emotions when they sacrifice for their partner- And that this, in turn, will reduce satisfaction with the outcome of sacrifice, and will subsequently affect personal and relational outcomes (e.g., mood and relationship satisfaction, respectively). Romantic couples (N = 130) participated in an experience sampling study that assessed emotional suppression immediately after making a sacrifice for their partner in their daily lives. Results showed that trust negatively related to emotional suppression when making a sacrifice. Moreover, we found that emotional suppression led to lower satisfaction with the outcome of sacrifice, which in turn resulted in a lower relationship satisfaction (and a negative mood). We discuss the importance of trust in emotion regulation in close relationships and engaging in behaviors that prevent (or confront) relationship conflict.