["Applied Psychology, Volume 75, Issue 3, June 2026. ", "\nAbstract\nThis study examines the hidden consequences of the growing demand for constant work connectivity in contemporary workplaces. Integrating social exchange theory with boundary theory, we argue that heightened work connectivity triggers employees' unethical pro‐family behavior (UPFB), mediated by perceived psychological contract breach. Additionally, we propose that individuals with higher levels of work–home segmentation preferences (WHSP) experience a more intense perception of psychological contract breach, which amplifies the link between work connectivity and UPFB. Across two survey studies and one experiment, we found that work connectivity was positively associated with UPFB via perceived psychological contract breach, particularly among employees with high WHSP. This research sheds light on the dark side of work connectivity and offers valuable insights to mitigate its detrimental effects.\n"]