My brothers "friend" keeps eyeing me, but I'm not gay!!!?

i wouldn't do anything at this point, but if he pushes it more, especially if it's obvious that he wants you, you should talk to him and tell him that you're not interested and that he should back off. If he denies any interest then he should stop bothering you, whether he really is interested or not. If he says he is interested, then you should tell him that you're not gay and that he should come out and stop lying to his gf and to others, in other words help him, but make sure he understands that you are not gay and that nothing will ever happen between you two.