I know EXACTLY how you feel! When my best friends moved away, they are like my sisters, I was devastated. They are 2 sisters, about 2 yrs apart, the youngest is 2 yrs older than me. I grew up with them, my mom and their mom are like sisters, since toddlers we were together. They used to live in my neighborhood but slowly they started getting further and further away. They moved to Queens, and my dad would drive me to their house on weekends so we were still close, then they moved to another house in Queens and we still stayed close(i live in manhattan), thennnnnn at 18 yrs old, (i was 16) the younger sister gets married, this is her 1st love, her 1st everything and moves to Virginia!!
VA! She never lived anywhere else but NY! Her older sister went with her. Now it's been 4 yrs, the younger one has a baby(still married) and the older one has moved back but to NJ to live with her older brother and SIL. Although we are all still close, we can not see each other for yrs and then see each other and we will still laugh hysterically and act like we never parted but it's true, once they moved away we barely communicated. I just saw them 2 days ago, I'm so glad they are visiting and they leave in a week so i am going to see them tommorrow. Their parent's live inthe Bronx now. I was in her wedding(younger sis) and i will always be like their little sister but i just had to suck it up i guess that we separated. And on top of that their older brother is one of my older brother's best friends. We all grew up together, always had b-day parties together, everything. So i know exaclty how you feel like.
It's sad but when you do see each other after they've moved it's like they never moved away.