Well, just be nice around the other girl, and try to flirt with the boy when they're not around. Don't talk about it with the other girl and try to get the boy to like you.
Find a nice hobby to refocus your attentions.
she likes him too. get over it
Find another girl that you like that DOES like you.
Wait and see what happens.
Then move on. If the girl has no interest in you then you shouldn't worry about it.
destroy him utterly
give up
Ask her.
not technically, if he is really interested in you and you bring your relationship further it mite turn into love. if he likes another girl.......well i would move on
Find another girl or risk getting hurt
Encourage the other girlfriend to steal him away from the girl you like. All's fair in love and war. If you want to know if she/he likes you,you have to show how you feel about them.
He likes the girl he kisses unless it was an he didn't mean to kiss that girl. or he likes the girl he kisses and lies and says he like someone else