both sort of. It truly depends on the people involved. There is no way to answer it for everyone absolutely
Wander no doubt. If the eyes don't see you, the heart will not feel for you.
Fonder. With distance one often tends to idealize the person/relationship and forget all the negative things.
Wander. No doubt about it.
fonder to a point
absence makes the heart grown fonder, but too much can make the heart forget
I would say a little of both.
wander for sure. Out of sight, out of mind