how if u luv sum1 but he dont luv u back bcoz d one he loves is ur best friend?

There's really not much to do here since we cannot control a person's mind neither influence other peoples feelings towards love. We can only be a good listener to a friend who needs to be understood. It is rather a difficult situation to be in since the guy he is in love with is the same guy who is in love with her bestfriend. It's just a matter of accepting the fact that she can never have the guy she really wanted unless the attention would be diverted to her. The question now is: Does her bestfriend knew that she is in love with this guy? If the answer is yes, her bestfriend should understand how she, your friend, would feel and would probably not entertain this guy since it would hurt her bestfriend's feelings. Unless, her bestfriend is in love with this guy too, then that could really be a problem.