Why would a guy gossip about a girl?

I know this for years and ever since I've known him he gossips about me with his frirnds saying im dirty, a slut and a liar and that i am disgusting. But im neat, i work for a huge company as a executive assistant i pay my bills live nice. He told everyone i am a slut i was a virgin upp til 26.
Why would a guy gossip about a girl?
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