Do I Matter? The Connections Between Borderline Personality Traits and Mattering

Abstract

This thesis examines the connection between borderline personality traits and mattering – ones sense of importance and significance to others. Although prior research has linked borderline traits to interpersonal vulnerabilities such as rejection sensitivity and attachment insecurity, mattering has received comparatively little attention as a distinct construct. This work positions mattering as a core relational perception that may underlie key characteristics of elevated borderline traits. To test these predictions, three studies were conducted using complementary methodologies in samples of U.S. undergraduates. Study 1 used a cross-sectional design to examine associations between borderline traits and trait-level mattering constructs. Study 2 used hypothetical vignettes to assess perceived rejection in romantic contexts. Study 3 utilized a daily diary design to assess fluctuations in emotional experiences and state-level mattering. Findings consistently demonstrated strong links between borderline traits and mattering, suggesting that these traits are closely tied to individuals’ perceptions of their relational significance.