I hear ya, I recently lost my best friend. We see each other all the time, but we don't talk anymore. I'll wave to her or say hello, but I just receive dirty looks. It's a bummer, but I've made new friends, and gotten closer with some of the friends I was drifting away from. Try an make some new friends! Put yourself out there for making them, others don't always have to make the first move. Good luck!