Interestingly, when I moved into my dorm this year I discovered he was living directly across the hall and it didn't take long before we started dating. Because we lived so close we saw each other more and which led to us liking each other more, this is know as the proximity effect (Latané, Lui, Nowak, Bonevento, & Zheng, 1995). The proximity effect states that how close we work or live to others is the best predictor of who we will be friends or lovers with( Latané et al., 1995). As such, typically the closer you work to or live by someone the more likely it is that you will develop a close relationship with that person. Our physical proximity increased our exposure to each other and we eventually ended up dating.
Latané, B., Liu, J. H, Nowak, A., Bonevemto, M., & Zheng, L. (1995). Distance matters: Physical space and social impact. Personality and Social Psychology Bulletin, 21, 795-805.
Zajonc, R. B. (1968). Attitudinal effects of mere exposure. Journal of Personality and Social Psychology Monograph Supplement, 9(2), 1-27.