People from all over the world heard about the series of Grand Theft Auto. It began a long time ago from parts, where all we could do is drive around the city, fulfil missions, and enjoy some simple shootings presented in an isometric point of view. Now, everything has changed. From this moment one could see a lot of changes and improvements.
If he talks to you a lot or sits with you on the bus or lets you borrow his sweet shirt or helps you with homework or like doing stuff for or with you or if he likes to come visit you talk to you on the phone walks with you in the hall carries your books smiles a lot when he sees you likes giving you hugs those are some things that he might do if he likes you
Well a sure way to find out is when your brothers friend is over your house visiting your brother does he go out of his way to seek you out and talk to you? If he says nice comments to you and he smiles a lot and looks at you, then I would say that he is interested in you more than thinking of you like his "sister".
Well he can just smile and try to talk to you or even just try to touch you. But because your bro is his best friend he may try to stop liking you.