How do I steal this guy's girlfriend?

Firstly, I'm a girl. And I met this girl, and it was love at first sight. No new news to me, because I'm bi. Turns out she is too. She and I became really good friends, but she has this boyfriend- this hot, manly, perfect, loving boyfriend and there's no way they're breaking up. Let's just say, I'm POSITIVE she's interested in me, but I don't know how to compete with big-friggin-man-hunk here. I've been biding my time, and I can play the game; I'm masterful at waiting. But should I wait any longer? Should I make a move? HOW do I compete with him? What's the best way to steal his girl right out from under his slimy, disgusting hands?
How do I steal this guy's girlfriend?
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