“…As investigations of interpersonal and intrapersonal aspects can lead to different conclusions (Hamaker, Kuiper, & Grasman, ), the untangling of the two different sources of variance (within and between person) is crucially important (Curran & Bauer, ). When focusing on long‐term development (over several years), CoF is theoretically conceptualized as a trait‐like behavioral tendency (Lischetzke et al, ; Salovey et al, ), whereas supportive dyadic coping is a relationship behavior that decreases over time, as longitudinal couple research suggests (Johnson et al, ). Hence, an intriguing question is whether interpersonal differences in CoF are a long‐term predictor of intrapersonal changes in supportive dyadic coping.…”