Most relationships do not survive being ripped away from the spatial and temporal context in which they were cultivated. How many of your middle school, high school and even college buddies do you still have a relationship with?
I think there's some stigma with confronting the fact that relationships are just ephemeral. We are social creatures in the sense that we can cooperate with each other on a task laid in front of us, but once that task is done, we mostly tend to drift apart onto the next task with another group of people. And that's okay. We're only weakly social with everyone except our direct family and significant others. The quality of a relationship is in no way measured by how long it endured.