I don't understand the conundrum. You want to fool around with your best-friends (?) girl? Boil it down for yourself - is he your bestfriend, or do you want her? You've already gone too far in my book. You call yourself a "bestfriend"? Get the fuck out of here. Do all three of you honest, and tell him what's been going on. Sure, he'll probably get pissed, but she'll be yours to have. By the wayside - what she did to him (or still does) she'll do to you.
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