Ask her!
If the girl officially likes you she will most likely tell you or show it by her actions such as flirting. One can also try asking the girl if she likes them or asking one of the girls close friends.
if he trusts you, tell him what you think about the girl he likes. if he doesnt stop liking her then, try asking him WHY he likes her. it might get him thinking...
you can by asking him
by asking her. although i think that's really young but yup that's how you do it
A better question might be "Why should I care if a girl likes you?"Assuming you were just too lazy to double-check and switch the pronouns around properly... you could try asking her.
You come clean and tell the girl you like's brother that it wasn't true unless she told you she likes you.
well depends if its a good friend or notidk wat u r asking.... srry
Yes, tell her because she is porbably asking you because she likes you. Tell her how you feel and it may start something.. you never know :)
By asking him.
Try asking.
you can tell if a girl likes you if she is realy nice to you
she likes you and is trying to know wether you like her or not. If you do then tell her but if you don't then let her down gently.