Give her a kiss. See how she responds. If you both like it, then enjoy. Be happy. Life is too short to not have fun. Life is too short to not be with someone you like. Life is SUPPOSED to be enjoyed. Life is what happens while you are making plans.
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.
You can't make anyone like you. Liking someone is a choice. Just be his friend and that may turn into something more.
Wait and see what happens.
Then move on. If the girl has no interest in you then you shouldn't worry about it.
Get to know that person just like you would with anyone else and see where it goes.
Yes
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
destroy him utterly
give up
Ask her.