she is not my friend

Me and Shirley were besfriends..but..after we turned 15, she became a completely different person..she met a new friend,Danise..

at first, i was okay with it..but then, things just seemed wrong..Shirley and Danise would go to recess without me..they were trying to ditch me..then they would giggle and laugh together..

Shirley would tell all her secrets to me..but now..her secrets are only meant to be shared with Danise..everytime i try to be friendly with Shirley, she would walk away and talk to someone else...it's like they are trying to run away from me...