I think most plan on their escape well ahead of time. This puts them at a big advantage and the LBS gets dropped kicked into hell without a shovel.
Looking back I think my XW was planning on leaving me years ago. I just did not see the signs.
But in my case she had no real reason for leaving other than the lame ass ILYBNILWY BS. Her online love affair was all she needed to put it all into motion.
Me:48 W:55 M:22 T:23 Bomb:19Nov09 S:15Jan10 D:11Feb10 EA:Confirmed on 20Apr10 Fast track to her divorcing me