It's not a good feeling now Forester, but it's a common and necessary transition for most of us. And in the long run you'll find that many of these people were simply drinking buddies, who were there for the same reason...simply to drink alcohol. It's nothing personal against you, and it doesn't make them "bad" people. It simply means that the only commonality was alcohol and once it's gone there's no reason to have a relationship. You will meet many new friends that are interred in things other than alcohol too, it just takes a little time.