How do I stop getting a coworker to stare at me!!?

There is this guy at work (we have never talked before) who sits directly across the room from me during training and cant stop starring at me. I know he likes me cuz everytime I walk by he checks me out...its so obvious cuz even another coworker told me that she noticed him starring at me. Hes not ugly, hes actually kinda cute but i wanna remain professional in my workplace because I dont wanna ruin this great new job i have and in the past, having relationships at work have gotten me into trouble and i dont wanna make the same mistake twice.....

any suggestions, same situations of comments that will help??? thx!!!