What does it mean when a guy smiles and looks at you a lot but doesn't talk to you?

That happened to me with this one really cute guy. It turned out that he really liked me but was way too shy to talk to me. That might be the case in your situation.Usually means that they fancy or think you are 'hot' and you have there attention. make it obvious you wanna talk then he will come over. if you like the look of him that is!