Has anyone very close to you moved to another country?

I’m extremely close (and protective) of my siblings. There is no relationship in the world more important to me than the one I share with my sisters. My sister has decided to move to Australia, from the US, in the spring, and I am crushed. I was devastated when my youngest sister moved an hour away.
I’m not (and really don’t ever expect to be) in a position to travel much, certainly not on the other side of the globe. The reality is that once she moves, we will probably never see each other.
This was a really sudden decision, so I think the surprise factor has made it especially hard to swallow, but I know that I would struggle either way.

Has a loved one moved very far away? Were you affected? Happy for them? Was it difficult to cope with their absence?