I have a friend that I met at the start of college 2 years ago. She'd transferred from a different college and seemed to latch on to my group so she wasnt alone. We were really close friends at first, but after a few months when she'd met some new people she just stopped bothering with me and basically ignored me. She became friends with a girl who really didnt like me, and started being really bitchy (calling me fat because she knew Id had an eating disorder and was insecure etc). She fell out with this girl and we sort of became friendly again but in my eyes, it'll never be the same coz I saw her true colours. We didnt really talk much for the last few months of college.
Now its turned out that we're going to the same uni (we're the only ones from our college going there). I didnt plan to go there from the start as it was originally my insurance but as soon as she found out I didnt get my grades and was going there, shes suddenly started talking to me and trying to be my friend again.
Im worried about it coz Im living on campus and shes not (shes going to commute every day) and i have the feeling shes going to try and use me like she did with college. It sounds horrible but I dont really want anything to do with her, yet she seems to think we're suddenly going to be best friends. I dont want her trying to stay the night in my room and use it between lectures all the time. She didnt bother with me before and I dont see why I should bother with her now.
How do I subtly let her know that I dont want her staying in my room and clinging to me etc? I dont want to fall out with her and make it awkward but at the same time I want her to know Im not going to be walked all over like i was a few years ago.