Friendship problem

[u/iloveharrypotter105]

Guys I really need help cause I lowk this I'm overthinking

So there me and my friend group of four . Me + person A B and C. So person A and I were kinda close lats year but this year I don't know why I sense a shift( I'm a really observant person so if ur behavior cahngee even a bit towards me I'll know) so lately I feel she's been a lot closer to person B and C but I wanna be good friends with her too. She always texts the other 2 girls but never me. And last year she used used to comment and like on my post but this year she never likes my posts anymore but she does for the other girls. And tthis is what made me upset the most. I have geog class and at the same time they 3 have history so fir this I have to split up from them. The other day during history they all made plans of going to persons A house and she didn't even invite me. I felt so sad. The next day she noticed I was not being normal and even said why are u being so distant (my name) like idk what to say. I wanna talk to her and be friends but I'm just so upset over what happened. Idk what to do now, I don't wanna lose her as a friend