Asshole exgirlfriend

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I broke up with my girlfriend a while back because we couldn't make the whole long distance thing work. We only met in person from school for about a month but she could still be kind of a bitch. She got really sad though after we broke up. I went to a summer camp and everyone has some Snapchat group chat. I join the chat and then she does too. She then starts telling everyone a fake story about how my close friend started flirting with her and grabbing her ass, and then I started saying how it was her fault for being hot. All of this is complete bullshit and she's ruining my life. I have no more real friends except for the person who was also framed with me and a few others who believe my side of the story. Everyone regards my friend and I as perverts because of my angry exgirlfriend. How should I handle this? Pic not related