What Should I Do About This Guy 10PTS?

There's a guy in one of my university lectures who sits in front of me. He usually turns slightly in his seat and stares at me thru the corner of his eyes when he thinks I don't notice. He's cute but he never talks to me. I've noticed he tries to get my attention like one time he did a very blatant doubletake of my face and it seems like he tries to catch my gaze. One time, I caught his gaze and he lowered his head and smiled to himself. Other times, he'll turn half way in his seat and just stare at my feet, or legs (crotch?) I can't tell, since I try my best to ignore him. But it makes me pretty uncomfortable and nervous when ppl stare like that. He has been doing this since January. thx