The truth is, most women don’t go through life with the same, single best friend. We’re human and thus we evolve, we adapt, we change—and so, too, do our needs. You probably refer to five different people as “my best friend” on a regular basis, and that’s ok! No one’s counting, and no one’s going to say you can have just one. That’s like, so Kindergarten, please.
We go through so many transformative stages during the course of our lives, it’s only natural our best friends reflect that personal growth over time. What you need out of a best friend when you’re 15 is very different from what you need when you’re 25, because you’re different.