I have a policy of not dating anyone from same university, even. In America, more than half of the ladies walking around campus everyday secretly or publically hope to meet their spouse while in college. Need an account? If it doesn't work out, it will make that class really awkward. Obviously there are exceptions, but as a general rule you should be taking every single opportunity that comes your way to make friendslearn about new people and set up college networks of friends.
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This is the same reason you shouldn't date co-workers, roomates, or neighbors
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If you're both mature enough, then you'll both be able to deal with the awkwardness when and if things go wrong. Follow Metro. See what happens, and slowly start contacting her first less and less, and see if she make up for it by contacting you more and more.