Do people benefit when they think their partner has made a sacrifice for the relationship? In a multimethod study of 80 couples, we examined whether people can detect when their partner suppresses their emotions and if perceived partner suppression is costly for the recipient of sacrifice. When people listened to their partner recall an important sacrifice in the lab and when people thought their partner sacrificed in daily life, they thought that their partner was less authentic the more they perceived them to have suppressed their emotions. In turn, perceived partner inauthenticity during sacrifice was associated with poorer personal well-being and relationship quality. These effects persisted over time with perceived partner suppression predicting poorer relationship quality 3 months later. The results were independent from the influence of an actor’s projection of their own suppression and their partner’s actual suppression. Implications for research on emotion regulation and close relationships are discussed.