A girl keeps calling my boyfriend her best friend, what should I do?

Defense11
A girl keeps calling my boyfriend her best friend. He's the first person she goes to about everything. But I find it inappropriate that she likes to tell me how close she is with my boyfriend and she actually gets mad when he's told me something he hasn't told
her. The worst part is I'm kinda friends with girl and I don't know what to do. It makes me super uncomfortable and jealous we have been together for a year and they haven't been friends that whole time. I trust he doesn't want anything from her, but I don't trust her. He always text her on advice about what to do about our fights or what to get me as a present or anything. I just feel like I should be his best friend that's a girl. What do I do?
Updates
+1 y
I'm not 15, I'm 19. I guess I put in my birthday wrong. He's the same age as me. This girl is a year younger
Updates
+1 y
K talked to my boyfriend about what this girl has been saying to me in more detail. He was unaware she thought they we that close and was a little creeped out to be honest.
A girl keeps calling my boyfriend her best friend, what should I do?
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