What should i say? plz help !! 10 points !?

Ok , so i wanna ask this guy his cell num.. i was thinking something like this.. "heey i lost my cell num can i have yurs? :)" lol but thats cheesy.. were in gr 7.. i realllly reallllly like him.. and if u look at myother questions on my page you can see our history. so plz help ! what do i say? and what if he says "NOOOO!!!!!!!!!!" ..