Tell her you like her... maybe she still has feelings for you. You never know until you ask. Also, try talking to her. Being friends with her will increase your chances of getting her back.
talk to her.
Back off and wait.
in here facial expressions
if the girl that you like is always around you and hitting you softly or really close when you walk then she might like you. If you notice these things flirt back with her and get to know her. Then when you guys get really close to dating ask her is she allowed to date.
you get a life
You can't really get a girl if she doesn't like you back, but you can try. Get closer to her, become a best friend. Eventually she'll tell you secrets and stuff like that and eventually she might start liking you like a boyfriend/girlfriend, but if she does not. Well, you can't MAKE her go out with you.
Turn homosexual, that's what I did and I have this great boyfriend named Travis.
if he is really into that girl then back off but still be strong friends. if that girl and him break up then after he recovers ask him out
Back off and find someone else.
There's no such thing as friends. Just stab him in the back (figuratively speaking) and talk to the girl about how you feel.
Talk to her! The worst she can say is no! And, if you like her as much as you say you do, chances are she'll like you back. Good luck!
if i were you i would just ask her straight out 'i really really like you do you feel the same?' it may be embarrassing but it would be worth it in the end