Tell your best friend, see if it's serious from her/his perspective.
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If you do not share the same feelings, it is important to communicate this to both your best friend and her brother in a respectful manner. Setting boundaries and maintaining open and honest communication can help navigate this situation without causing harm to your relationships. If the feelings are mutual, consider discussing with your best friend how to move forward in a way that respects everyone's feelings and boundaries.
Well, if your "Best Friend's Brother" likes you, all you have to do is stay calm and act like he is just somebody in a crowd and ignore it.