you have to tell him clearly - guys dont understand if it's not clear
If you were interested you are not anymore. You are interested meaning you still are: you were interested in one guy but now you are interested in a different one.
Flirt with him.
Yes - more than a tall girl being interested in a short guy.
It can be very difficult to understand what a guy thinks about you. If you are interested, you can directly approaching him and ask him what he feels like. Believe me he won't make much issues if he doesn't.
Some guys can understand it alone but the majority need you to tell them.
that means that the guy is interested in the girl and that the guy wants the girl to know but he is kind of shy to tell the girl so he tells his friend to tell you. is that girl you though? becasue i dont really understand this question.
just be yourself around him
Well, if she's really interested about the guy then you should still be friends. Maybe you should tell her that you like him. If she is your best friend then she'll understand.
We don't really know what kind of guy she is interested in since she hasn't talked about that before.
They want the guy to know that they are interested, but they want the guy to make the first move. They also might be playing hard to get.
just show it through your behavior show him your not intrested in him him but being friends with him he'll understand
By making the guy think you're not interested in him.