Emotion regulation difficulties and interpersonal conflict in borderline personality disorder.

Borderline personality disorder (BPD) is characterized by both emotion regulation (ER) and interpersonal difficulties. Although the link between ER difficulties and interpersonal problems in BPD is well documented, less work has examined the directionality of these associations. The present study examined the temporal relationship between ER difficulties and interpersonal problems among individuals with BPD features in daily life. Participants were 173 undergraduate students who completed daily questionnaires for 2 weeks. Participants were prompted to identify their most stressful events each day and report their use of maladaptive ER strategies (i.e., expressive suppression, worry/rumination, and avoidance) and interpersonal conflict behaviors (i.e., argue, hit someone/throw things). BPD features were associated with greater interpersonal conflict and ER difficulties. Unexpectedly, maladaptive ER strategy use did not predict next-day interpersonal conflict. Interpersonal conflict significantly predicted next-day maladaptive ER strategy use; however, this association was weaker among those with elevated BPD features. Implications of these findings for treatment are discussed. (PsycInfo Database Record (c) 2021 APA, all rights reserved).