Friendships Ending

When your little you hope you can find one person that can be your best friend forever. I never found that in any of my friends because sooner or later they all changed. Recently I have lost one of the closest friends I have ever had. She literally new everything about me and she just changed and so did I and now we don't even speak. Its really sad to me because we were so close. I've come to realize that sometimes you just need to be alone and not have friends be your number one priority. It just sucks because now I just have to hope I can find someone that I can be as open with as I was with her. I'm sure there's someone out there. Hopefully...