That's a tough one when it's someone you've been friends with for a long time. We've had those seasons of friendships that come and go and while it's not always something dramatic that fractures the relationship, it still can be painful. Sometimes its just life timing, jobs, kids, change of interests or other. Recently just had one make a full circle where someone we were close friends with, who then ebbed out of being quite as close, to back to being somewhat close friends again. It's odd how that happens sometimes.
That's my hope is that somehow we can get back to that point again. It might not be the same as it was, but to at least have that connection again. It might just take some time I guess.