My question is, have you seen/heard of any other situations where a WAS is so far removed and is not the slightest bit concerned about her LBS?
Yes. I have seen practically everything.
The question to me is always "what things can I do that give me the best chance to reconcile?"
In my observations over many years and in just observing reality (not what I think should work or happen, but what DOES work or happen) are these common things that seem to crop up when the WS decides to come back...
The BS lets go and stops pursuing. The faster they do this, the faster the reconciliation
They display confidence They pursue other interests and activities and hobbies They start seeing other people or find someone else (which I have seen turn the WS around faster than anything)(the relationship then does a 180 and suddenly the former WS is now the BS and vice versa. The former WS is now chasing the former BS.) (I have found this to be a common theme) The former WS NOW knows exactly what it feels like. They dump the OP very quickly in many cases.
Your choice what to do, but these are the things that I have noticed usually happen that cause the WS to change their minds even when it looked hopeless. I have found that the hardest one to get the BS to understand is the "dating" part. I wish I could say that it wasn't one of the observations, but then I would be lying. Jealousy is a POWERFUL emotion that is not recognized on this site, that works wonders. I think that it shows the WS that you HAVE let go, which they had not thought about because they have been in their own little world. Suddenly they are faced with another reality... "Is this what I really want? Is it too late?, I didn't know I would feel THIS way"
Pursuing and hanging in there by the BS never gives them that reality. The thought of the WS while you are pursuing and hanging in there are usually this... "ILlYBNILWY, I need space, I don't want to hurt my BS, but I just don't "feel" the same, and of course they are focused on the OP.