walk up to the girl and say "I love you" . the worse situation she would say,.............either way, its worth trying..... I still remember a friend of mine who proposed a girl who he knew and used to talk to her. Here it what happened: He says" $$$$$$$ i LOVE YOU" She said " go to hell" His reply " will you be there?" This way you could still show that you are still serious on her....maybe like a hindi movie...:P