Here some real life experience. I met this girl, I showed interest (us guys are VERY obvious about showing interest). After a while, she was giving me strong signals, specially the eyes, that kind of gaze that tends to melt a guy and I made a move, she shot me down. After that she seemed annoyed when I talked to her and didn't find any of my attempts at humor, well, humorous. After that I decided to play it cool and focus on other girls. After a few days, she would come up to me and make small talk, if I answered she would elaborate on that to keep the conversation going (when she used to give very short, crippled and cold answers when I "showed" interest). Also, now she finds everything I say hilarious, she laughs, even if I'm not talking to her, if I make a comment to somebody else and she is near, she is like laughing even though back when I was joking WITH her, she wouldn't laugh at all. Moral of the story is, eyes don't lie, if she likes you (even though she says she doesn't) and you stop paying attention, she will come around. Don't be rude about it, be nice and polite, but don't show as much interest or focus on her, she will pick up on that and start taking matters into her own hands.