@-SLUUURPY- hmm
It's very obvious to both parties that this is rlly like a trap and is very tricky situation.
Just tell him, 'oh man. Dont do this to me' or smth. If not, then 'sorry but,, I'm not interested. And it's not because of how you look because while it IS true that being pretty plays a huge role in attraction, it doesn't always mean I think you're ugly. Some other girls out there will find you attractive. Sorry, but now if you'll excuse me, I'd like to [continue what u were doing. Studying, focusing etc].
Just say that in the tone of uhhh, 'hey, uhh don't pull that on me or anyone pls. Ur not ugly, but I'm not interested. I'm only one person and that doesn't judge you whole as a person'