Bad idea. Sorry to say it, but it really is. All my friends who had boyfriends/girlfriends when they went to uni [not necessarily at the same uni], had broken up within 6 months. One of my friends went to the same city as her boyfriend to uni, although not the same uni, and they found it too close.
Three lads I know went to the same school together, are best friends and came to the same uni together. How sad. Uni is about independence and meeting new people, not clinging onto what you have at home.