I might be falling for my best friends boyfriend?

The question is not what you should do, but why you have chosen to like a guy who is unavailable. Some girls think that love "just happens" -and if it's with the wrong guy, they can't help it. But the reality is that whether it's conscious or unconscious, we do choose and have control over which guys we fall for and pursue. When we select a guy who is available, we are willing to risk possible heartache for the sake of love. If we're emotionally healthy and the risk doesn't pay off, we know we can always pick ourselves up after the pain and find someone better.if you choose a guy who's unavailable because he's with someone else, the risks are obviously far greater-you risk hurting yourself, your friend and the guy. So why go there in the first place? Perhaps you envy your friend because she's attached to someone nice, and you have a crush on him because you long for someone special too. Clearly, that's a poor choice.So in answer to your question, my advice is to "do" nothing about your crush. Keep your friendship with both of them, pursue a guy you can have something real with and, most importantly, remind yourself you're good enough to get the whole cake, not someone else's crumbs.