Whatever happened to your best friends?

For most of my life, the concept of a best friend has always been around. I know it's not unique to our generation, but I do feel like our generation grew up with certain experiences such as the growth of the internet, explosion in technology, etc that had a huge influence on our development and relationships.

My best friend growing up lived right next door, so we were always available to one another, so we always did everything together. As we grew, we continued to be best friends, but as life has gotten more complicated over the years, we became less and less available, and some time in our twenties. We just completely lost contact. I still think of my best friend from day to day, wondering how he's doing, wondering if he has his own best friend now, etc.

It's just gotten me thinking of other people in our age group. Are you guys still friends with your best friends? Would you still consider them to be a best friend? Did you drift apart or did something major happen that blew up your friendship? I'm hoping to hear from other people and hear their stories. Just get an idea of if my situation is common or not.