There was no Wi-Fi or cellular signals available and so this was considered a challenge since there could be no “cheating”.
As for the adults, they discovered that a week in the company of unhappy children did not have the same charm as a few passionate hours alone in a hotel room. (snip) But the two did get back together one last time - when CBS was considering Katie for the anchor chair. Katie isn't the brightest light bulb in the box.
Fear of the abuser's threats is usually the #1 reason, but lack of social support or fear that nothing will happen to the abuser also are reasons.