What to do?

So my boyfriend has this friend group that he’s been friends with for a while. In the friend group theres this girl who used to have the BIGGEST crush on him and he kinda has a past with. He never dated her but they used to kiss and hu but never sex. She flirts with every guy and makes me really uncomfortable bc she flirts with my boyfriend all the time and infront of me. I mentioned it to him and he said thats how she is with everyone. She doesnt seem to like me so I asked her if there was a issue and she created a whole big deal out of it. Now shes always asking my boyfriend to go to bar with her, club, beach, college parties. And it makes me rlly uncomfortable and she never invites me knowing im 21. I haven’t seen her in a bit but she also posted this tik tok and put him in it but no other friends. If no one knew he was dating me they would think shes with him. I told my boyfriend about it and said that it made me upset but he didnt understand i guess. He just said oh i made it on her tik tok? He says he doesnt want her so it shouldnt matter but to me she disrespects me and makes me feel anxious. Anyways a few weeks ago when I told him about the tik tok he went to look and searched her name up he realized she was blocked and got mad at me for blocking her and not telling him since shes part of his group he doesnt want to block her. I went on tik tok today and realized that he started following her today and she followed him and it made me nervous. I know he would never cheat but I do not trust this girl and really want him to stop being friends with her. He thinks im jealous which maybe I am a little but how do I make him see that. He doesnt want me to control who hes friends with and I dont want to either but she has been bothering me for almost a year now. What should I do?