I've tried everything with her, is it time to end it?

My best friend and I have been friends since 1st grade. We've been through so many good times and bad times too. We call each other BFFAE for Best Friends Forever And ever. but it doesn't seem like it anymore We started a new school year together and we've grown apart. She's been pushing me away. i started seeing my school guidance counselor to talk about what I'm feeling. My friend and I have been friends for a long time and my guiddance counselor said it's just a phase and you'll just need to talk to her. Every time I talk to my friend, she pins things on me like, you never come to me to talk, when i do. She makes up excuses and she makes it seem like it's my fault. One day, she came over my house and we played truth or dare with her cousin..she asked me is it true that sherin (other friend who cheers me up during my fights wuth her) is your best friend..I said yes because I didn't want to lie. She got so mad and left. i wanted ti be honest and come to say I didnt feel like she was my best friend. All over facebook is pics of her and he other NEW best friends. And i was totally shut out of her life. Should I just end it now before it gets worse. I want to but how? Thank you