I just lost my best friend...

My best friend who has been my rock for the past almost 10 years has decided to end our friendship. She believed that our morals and values have been different for a while but held onto the relationship because of all that we have been through together. We have been there for each other all throughout high school and spent our entire college lives living together. We considered each other family. She was supposed to be my maid of honor for my wedding in January. Although we live in different states we spent every single day calling each other, catching up, and venting to each other. She was supposed to fly out in two weeks to help me pick my dress. She had planned out my bridal shower and bachelorette. And now I don't want any of that. Call me a bitch but losing my best friend who I saw as my sister has broken my heart in such a way that it's complicated to explain. I can't go on and do the bridal shower and bachelorette knowing she isn't apart of it. Although I respect her decision and we ended on good terms. It's hard to understand that we are no longer friends. It feels like such a terrible nightmare. I am so heartbroken and speechless...