wife preparing to leave me and kids

[MrBond]

It's like there's a fire under their butts to get out of a burning building. That feeling of theirs doesn't last.

IMO they feel that they need to get out before they change their mind. Or the guilt of what their doing catches up with them. This is why no matter what the LBS says, it manages to piss them off and want to leave even quicker. Of course it's easier when they have someone to run to. Even though that person is usually a loser.