Problem arises when neither of them had expected to drift away and yet they do! the hurt is one that leaves both grieving but they eventually accept it.... like theys say out of sight is out of mind!
here is the step by step sort of a story!
well both assume the other is busy
and think of not disturbing the other
Both feel the other should be the one who tries to contact first
After That each Will Think Why I Should Contact First ?
all the friendship is lost in this process
Finally Without Contact The Memory Becomes Weak
They just move on