So your best friend likes the same guy well i say あなた just tell her what's going on and tell her where あなた stand. Just tell her that if he (the guy) ever asks one of あなた out あなた have to respect her that あなた will fight for him and not afraid to get ugly. But not ugly enough to ruin your friendship but just enough to 表示する him your and american BADASS and your not afraid to get dirty if あなた have to. Just tell her that if he asked her out you'd be happy for her even though あなた wouldn't. Also tell her that if he asked あなた out of course you'd say yes but you'd want her to be happy for あなた too! Even if it does kill あなた a little on the inside.
So i hope the アドバイス really helped あなた and your best friend understands it and she wants あなた to be as happy as i want あなた to be.
BRIDGET14 -h8ters gonna h8t <3