When a romantic partner behaves in an annoying way – for example, by leaving a mess – we might respond with frustration or understanding. Responses may vary with contextual factors, including whether the partner could be mentally fatigued or depleted. We hypothesized that limited willpower theorists – who believe self‐control diminishes with use – might be especially likely to consider their partner’s preceding mental exertion. Two preregistered studies (combined N = 428) examined participants’ responses to four hypothetical scenarios. Limited theorists responded more compassionately to infractions performed after fatiguing days than to those performed after relaxing days; non‐limited theorists responded more consistently, regardless of context. Beliefs about one’s own willpower, rather than beliefs about one’s partner’s willpower, can affect how people respond to their partner’s undesirable behaviours.