This study examined early adolescent romantic "churning," defined here as having a large number of boyfriends/girlfriends by age 13, as a problematic marker likely to predict hostility, abuse, and avoidance during conflict in later relationships. A sample of 184 adolescents was followed through age 24 to assess predictions of hostility, abuse, and avoidance during conflict from early romantic churning. Controlling for gender and family income, romantic churning at age 13 predicted relative decreases in peer preference and relative increases in conflict and betrayal in close friendships from ages 13 to 16, as well as higher observable hostility and self- and partner-reported abuse in romantic relationships by age 18 and greater avoidance during conflict with romantic partners by age 24. Findings remained after accounting for attachment security, social competence, and friendship quality in early adolescence, suggesting that early romantic churning may uniquely predict a problematic developmental pathway.