I don't really have much experience with your kind of problem, since the university I'm at (Leeds) gave me accomodation for the first year and now this year I'm living with the same nine people in a big rented house near campus. However, in your case I think the best thing to do is try and talk to your friends who you'll be living with and try to see what they all feel. If you tell them about your little experience they may decide themselves that somewhere else would be better, or they'll probably support you if anything does happen with this guy. Normally I'd be saying don't judge a book by it's cover, but that does seem a little creepy of the guy so I'd advise you talk to your future flatmates and see what they say. Just out of interest, what uni are you going to?
