What should I do about this love triangle?! :(?

Leave him alone. If she's really your "bestfriend" you guys wouldnt let a guy get between you two. And he's no good if he's messing with both of you. This happened to me before. I eventually got the guy, but realized he wasnt worth our friendship. Long story short, I dumped him, got my bestfriend back, but we're arent as close as we used to be.