Girl chasing my boyfriend, what should I do?

So my boyfriend is friends with this girl. When my boyfriend was single, she was not interested in him. She was interested in another guy and followed him around. My boyfriend did like her (he was into both of us, into her more..) but she didn't like him back at the time. I was aware of it. So after like weeks after me and him have gotten together. I don't know what happened but she is so into him. She follows him around.
Every day the first thing she does is see him. My boyfriend ignores her whenever im around. My boyfriend is friends with her and does talk to her when I'm not there. He won't talk to her when im near and he will move away from her when im there. I'm so scared because he used to be into her.
Girl chasing my boyfriend, what should I do?
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