What should I do about this shady girl who shld back tf off my dude?

My boyfriend has been tellin me about this girl who's his friend but she be textin him late at night, she said she don't like me to him "just because", she's nick naming him, crudely staring at me, and doin a lot of flirty stuff like drawing hearts on him and wrapping her leg around him at the movies... all while claiming she's a lesbianšŸ˜‘
What should I do about this shady girl who shld back tf off my dude?
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