I have the same reservations about my stbx, he probably will move out of state in the very near future, and I'll have to deal with that too.
I have nightmares about him with the kids, I know he says he loves them, but he was never there for them, and I wonder how he can take care of them now if I send them there with him and his girlfriend. (which there will be no overnight visits due to a court order since he's living with a female while we're still married)
Luckily so far I haven't had to deal with long separations and I wonder how I'll cope when the time comes. Hopefully it wont be for a very long time.
good luck to you, let us know how it goes..hugs,Cindy