So my bf of a year often hangs out with this girl who we are both friends with. The thing is, she always flirts with him. Like once she lowkey sat on his lap while he was sitting next to me and then another time she was like stroking his knee when they were sitting next to eachother, she does acts like this frequently. We are all friends and ik he will deffff not cheat on me with her, but it still bugs me when she goes to his house or he to hers. Usually his brother is there, I assume, but I wouldn’t know bc I’m not there and he does not tell me about it

What do I do? I know I need to let it go but it’s hard, please help

(Ok more info: yeah we r friends but when he shows up she starts being hostile towards me. And other people have seen her acting towards him. He knows she does this, it took me a long time to persuade him, but he still doesn’t do anything about it? Like when she starts talking bad about me to him, it obv is a little much... rly great friend ik)