losing friends?

Sarah • I am a 18 year old, level 8 gymnast & dancer. I want a job as a gymnastics judge & coach, dance teacher,and a physical therapist.
I've been best friends with this girl since I was in first grade. We are still talking but she has kinda pushed me away.... It all started when she went to a summer camp, she meant the guy that she became friends with. He is a alright guy but she will only talk to him now, like we will be hanging out and she won't stop facetimeing/ texting him. Me and her would tell Eachother EVERYTHING but now I don't think she even wants to be my friend and I just kinda seem lost of what I should do now. What do you think I should do? Can someone please help me?