Haha, a girl and a guy can DEFINITELY be good friends. =) i mean, sometimes it's even better having a guy as your best frend than a girl. You'll be shock with the amount of girls that actually rather tell their best guy friends their problems than their girlfriends. =) I,myself personally have more guy friends than girl friends...and i enjoy the company of my guy friends, they are laid back, fun to be with, funny, they like to fool around, sometimes you think they dont care- but when you're in trouble or sad, you'll really see what a gd frend they are... =)

obviously, feelings can develop from there, AT TIMES. NOT ALL TIMES.
+ how do you expect relationships to work out without being friends with a person first. I mean i wouldnt want a guy who i'm not even friends with to be my bf, i dont even know him. BUT THAT doesnt mean being gd frends, means DEFINITELY one of them likes the other. =)