My "bff" started rumors then took my guy!

My 'BFF' just started TONS of rumors about me, then she asked out the Guy I've like since Freshmen year! What do I do? I'm a senior now. She's never been like this before. She acts like the devil to me in school, and an angel outside of it. I HATE her for taking the guy, and none of my friends believe me about the rumors or even though they KNOW she's dating him and that I liked him for 3 years now. So I have absolutly no support . . . He and I are good friends but . . . . What should I do? I've tried to move on. But I can't . . .

well they say the best revenge is living well...meaning don't let show that it's bugging you. be super nice to her when you see her and try and hang out with other people. you'll meet another guy. plenty of fish in the sea!