What shall i do?????....please suggest....?

i hav a crush on this guy...whom i met a few weeks ago...v hav been getting along well wid each other & hav loads of things in common to talk bout...but....wen i askd his opinion on crushes n all....he told me honestly dat he's allergic 2 crushes..n he jst lyks flirting......i kinda wanna tell him dat i hav a crush on him but m scared dat it may affect d friendship....so..wat do u guys think??..do u think i shud tell it ryt away or wait for sumtym...or never tell??....if u think i gotta tell it ryt away....how can i do so...such dat it wont affect d friendship.....plzzz do suggest...thank you!!! :) :)