re: Your girlfriend's best friend is being cheated on by your best friend.

quote:

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If I were to tell her, it would increase my chances of a threesome. It had been brought up before.

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The bro law explicitly states:

Bros before hoes.


However, there is a little-known and rarely quoted corollary that states:

Threeways before bros.


And what kind of a bro would your friend be if he came between you and two hoes? Because, as we already know, bros before hoes.

So, your path is simple.