Accept the Change.
It's so hard to accept change when you thought that everything was going to stay the same between the both of you. You have been replaced and it hurts. All of a sudden, she changed, you felt like you didn't know her anymore. It seems like she is just a friend or some person from the past. The friendship seems not to exist anymore. The things you planned with her in the past probably won't happen anymore. I do miss her a lot. She made me a better person and she had been my best friend because of that but the fact that we don't communicate anymore hurts me. But I'm not dwelling on it. Things happen for a reason. I'm still happy that I have people that continues to stay with me and not let the distance become a hindrance in our relationship.