Girl best friend??

My boyfriend has a girl best friend. I personally don’t know her like that, but I met her last week and she seems okay. She has her own boyfriend but she always wants to do double dates and hang out with my boyfriend which I try to respect because they are bffs. However I personally don’t always wanna go on double dates and enjoy time with me and my boyfriend just fine. Last night she made a comment saying she doesn’t want him ( my boyfriend and best friend) to have to choose between her and me. Wtf is that supposed to mean??? For some reason that comment made me uncomfortable because why would he ever have to choose between her or me?? He always tells me nothing will come between us and I’m the only one for him. But honestly I wish she would just go away. I understand the friendship the have but I don’t always want her around taking him from me I feel. Idk... this is confusing. I feel like I’m being forced to be friends with her but I don’t really want too