Is it normal to feel like this?
Ok, so I have this really good friend that I've been really good friends with for four years now, and even from the start we've always clicked. But this year, she made another really good friend. For a while I was ok with it, because I was really good friends with this girl too. But right now me and my friend are recovering from a fight we had, and after the fight I felt we'd never be as close as we once were. Also, my friend has been getting closer and closer to this other girl, and the other girl says that she's her best friend, and I can't help but feeling a little left behind, because I'm worried that the other girl might be my friend's best friend instead of me.
I would be alright with this if me and my friend hadn't been close friends for so long, and if it wasn't so clear that the other girl is very close to her. Is it normal for me to fell left behind like this, or am I just being selfish?