I think some of us are just better at keeping in touch and you sound like the dependable one of the group! Still, it is sad that friends go their separate ways... the older you get the more you realize you need the friends who knew you when you were young!
I just moved to NC last year and I am trying to adjust to living in a new state and being newly married. It is hard! Facebook has helped me "keep in touch" with a lot of my high school and college friends. I also just joined a women's meetup group in my town so hopefully I can start making some friends around my new town. That may be something for you to do while you are looking for work. You could maybe even volunteer and meet some friends that way. What do you think?