Ex attends college of choice?

I realize how this question sounds (stupid) and I also realize that the entire purpose of college is education. But the college that I am most interested in has one flaw, my ex attends it. My main concern is that he tells people that I am obsessed with him and stalk him which couldn’t be further from the truth, we ended on very bad terms. He spread so many rumors about me that once when I saw him, I threw up b/c I was so stressed over how he was making me look to other people. Sounds high school? That’s b/c it is, we broke up when I was in 10th grade, yet he still holds a grudge against me. (I’m a college freshman) I even tried talking to him and he still acts the same way. My friends tell me that it is b/c i am much better looking than him and he wants to show off 2 his friends. I realize that colleges are huge and I probably wont run into him, but if I do, what should I do? I would really appreciate if a guy responded b/c maybe they know why he says all these things?

Thanks =)