My bestie is choosing someone else?

I have been best friends with her for 3 years, but she and I both mutually agreed about a year ago that we were each others best friends. recently, we added a girl named Sarah into our group. and my bestie has been talking to sarah a lot which isn't a problem but I've noticed my bestie keeps forgetting about me, and Sarah will actually have to remind my bestie, that I'm in that group chat too. my bestie has been really chatty with sarah and barely me, but when I see my bestie in person she's so excited to see me and everything and hang out, then I'm like out of the picture. i honestly feel super left out.
My bestie is choosing someone else?
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