The purpose of this study was to examine the longitudinal relations between attachment state of mind in late adolescence and romantic relationships in adulthood. Participants were drawn from two independent studies that were conducted respectively in 1992 and 1996 and that involved the administration of the Adult Attachment Interview (AAI) to 167 college students. They were followed-up in 2007 (N = 99) to investigate different aspects of their romantic relationships since college. Those who had shown greater preoccupation with attachment in the AAI were more likely to be single in adulthood and to report romantic relationships of shorter length. In addition, they reported lower levels of intimacy, commitment, and passion in their current or recent romantic relationships. Dismissing tendencies were associated with higher levels of perceived passion in romantic relationships. Most of these associations remained significant after controlling for intervening life events, different dimensions of individual adjustment, socio-economic status, as well as probable life events derived from the AAI.