We broke up 2 years ago; we've both dated other people since then. We still go to the same university, and whenever I see him on campus, he always stares at me, whether he's close by or across the room. Sometimes he holds the eye contact and other times he looks away quickly. He's even turned his head to look at me before as I've walked past. I've kind of been missing him as of late, but I don't know if he'd be up for restarting something. We haven't talked in nearly a year, so I don't know if it's just a case of him looking because of our history or because he's actually still got a thing for me. Should I bother talking to him?