This woman is hunting my boyfriend! Advice?

I'm in a long distance relationship, and we're happy. This one woman at my boyfriend's workplace has been on his from day one. Before I was even in the picture, she tried to give him her number, but he doesn't like her. Then even after she knew about me, she somehow schemed and got his number from someone else's phone. The week before she quit the job, she started sending him texts, propositioning him for some no strings attached . She said she had been anticipating him for 2 years, and that she could show him a "good time" and all this BS. He didn't respond, and I THOUGHT she got the picture. Now, she texted him again, this time giving him a picture of herself topless! He erased it, and is disgusted by her, but I'm still angry that she's being so disrespectful of our relationship. Any advice?