Do you think it means something?

Right now I'm 19 years old female studying in university. About 2 years ago I wasn't really into the whole "dressing up" thing. I dressed okay and of course took good care of my skin and hair but no make up. So there was this guy he was okay I never had a crush on him or anything of this sort. But it turns out he goes to the same university with me. It happens that I see him on the bus often and every time he glances at me and thinks I'm not looking…and he will just stare at me the whole ride. I usually read something so it is easy for me to catch him. Yesterday he caught my eyes and gave me a smile. It is weird because in high school he never even said hi to me. Now that I decide to dress in expensive stores and use light make up he pays attention. Does he like me?