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Attachment style refers to the manner in which people form close social relationships with others. In addition to one's global attachment style, people also possess relationship-specific attachment styles. However, the factors within a relationship that can shape relationship-specific attachment have been relatively unexplored. The current work seeks to examine one such factor—mate value—that is, a person's overall level of desirability as a romantic partner. Whereas people who have a low mate value may be particularly anxious in their relationships because they are aware that their partner may have more desirable alternatives, people with high mate value may be particularly avoidant in their relationships because they may have access to many relationship alternatives of their own. In the current work, romantically involved participants received false feedback about their mate value (high mate value, low mate value, or no feedback) and then completed a measure of relationship-specific attachment. I hypothesized that a high mate value would lead to relatively more relationship-specific avoidance and low mate value would lead to relatively more relationship-specific anxiety. I also examined the subsidiary hypothesis that effects of mate value would be moderated by trait-level attachment, such that one's general tendency to be avoidant or anxious would be exacerbated by high or low mate value feedback, respectively. Results did not support my hypotheses. I found no main effect of condition or interaction with trait-level anxiety on relationship-specific anxiety. I also found no main effects of condition on relationship-specific avoidance. However, results revealed that among individuals high in trait avoidance, high mate value feedback (compared to controls) led to less relationship-specific avoidance. Potential interpretations of my results are discussed.