Me:27 F The bf: 27 M

As the title states, there is this girl who makes advances toward my bf nearly every interaction. What I'd truly like to do is rip her apart with my bare hands, but the problem is that his very close and good group of friends all like her.

For some back story, he and I have been together, off and on for 4 years. Things are very good right now, but there was a time when we broke up and she and him slept together. After we got back together he told her, and cut nearly all contact (she was out of state at the time so running in to her with the group of friends was not an issue). She returned to town for a visit and texted him telling him to come fuck her, knowing that he and I were together. He told her to back off and that she was very much in the wrong for doing that. She is now living back in town and showing up at gatherings. She is a pretty cool girl, she's into a lot of the same things that the group is into so I understand they are not just going to all stop being friends with her because I don't like her, but tonight at a New Years party that I was not at she asked my bf to go buy her cigarettes and she'd pay him back with sex. If I were there I probably would have killed her. My bf said no and ignored her for the rest of the night. But how do I handle this? She's going to be around, and is clearly going to keep making advances despite his disinterest.
user
A girl who the group of friends love, and hence
assistant
Me:27 F The bf: 27 M

As the title states, there is this girl who makes advances toward my bf nearly every interaction. What I'd truly like to do is rip her apart with my bare hands, but the problem is that his very close and good group of friends all like her.

For some back story, he and I have been together, off and on for 4 years. Things are very good right now, but there was a time when we broke up and she and him slept together. After we got back together he told her, and cut nearly all contact (she was out of state at the time so running in to her with the group of friends was not an issue). She returned to town for a visit and texted him telling him to come fuck her, knowing that he and I were together. He told her to back off and that she was very much in the wrong for doing that. She is now living back in town and showing up at gatherings. She is a pretty cool girl, she's into a lot of the same things that the group is into so I understand they are not just going to all stop being friends with her because I don't like her, but tonight at a New Years party that I was not at she asked my bf to go buy her cigarettes and she'd pay him back with sex. If I were there I probably would have killed her. My bf said no and ignored her for the rest of the night. But how do I handle this? She's going to be around, and is clearly going to keep making advances despite his disinterest.
user
girl keeps making advances to my bf despite his disinterest,
assistant