You don't really know if he/she likes you unless you write him/her a letter of some sort or something like that.
He likes you back!! He knows and if he flirts he is head over heels for you!!
ask him out
You can either ask HER, or her best friend :)
Get excited! Your crush totally likes you back! Ask him out right now!
Buy a vibrator and forget about him.
Rene
If he likes you back, he may do the same back.
No, wait for him. Speaking of, will you be my girlfriend?
if your crush knows you like them AND they like you back then you can gradually talk about dating them. if they have said they dont like you back then dont bring it up again
Go up to her and ask her if she likes you. It's never bad to be gutsy-the worst that could happen is that she would say no.
kiss them
then you gonna have to ask him somehow.