Does he knows about my crush? He keeps eye contact with me as long as I am in his sights why?

[Anonymous]

So there’s this guy whose living in my building I have a crush on but never said a word to him other then just greeting when meeting on elevator or something
Recently noticed that he keeps eyes contact with me even if we saw eachother from a distance..

Do you guys think that maybe means he is aware if me crushing on him?
and how would he know?

[Wise4myage]

Some guys can be pretty dense, so who knows? But why don't start making some small talk and flirt a bit?