We have spent almost everyday together for 16 years and she is my best friend. We complete each others sentences
You did. But now its not. Can it be again? Maybe. Maybe not. She didn't come to this decision overnight, nor will it be fixed any time soon...if it is fixed at all.
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.