Why does it hurt to not have her as a friend?

Things change and people change. You can't dictate what's going to happen in that regard, but you can figure out how you're going to respond. Accept change as a healthy thing and remember the good, but don't unrealistically expect that to be the case again. Just be content to make the best out of the time you have right now, and do your best to make the future even better.

First off thank you for answering my question your advice was appreciated. So I will return the karma, and because your a fellow Bostonian. Ne ways I think everyone has learned the sad truth of what getting older does to people. You keep her personality you knew and loved alive in the memories you've shared together and it's hard to adjust to her new persona. And it's going to feel as if you've lost a best friend. In reality it's just what happens in life when people grow up. You probably have changed a lot too without noticing it. You are both mature women now and should try and form an adult relationship that can grow on your childhood friendship. But sometimes you just become two different people and you might need to move on. It's tough and I fully understand and being an only child myself I know how important friends are when you don't have a brother or sister who has been there your whole life like your friend has.