Well, I'm at the same uni as my ex. He copied my UCAS form, and we both got into our first choice. It ended really badly, so I was scared of seeing him every day (the city our uni is in is tiny, you can barely go into the street without seeing someone you know), but in fact in the two terms we've been here, I saw him once in Sainsburys, and we weren't that close to each other so I didn't even have to speak to him. I'm guessing your Uni city is a bit bigger than teeny tiny Cambridge, so I don't think you have too much to worry about.