Personality types have quite a bit to do with this. Do not underestimate that fact.
A person with a preference to be a Feeling type on the Jung, (Myers-Briggs), scale is not likely to think much why they left. Most people, (even those with a preference for Thinking), leave because the "fear" of staying in, (and all staying in might mean at a particular moment), outweighs the fear of leaving. This becomes the tipping point, and pushes someone out of the KH door. The difference with thinking types, is they will try to understand why they left, (what broke or what was always broken). Feeling types might look for confirmation, but that is likely as far as they will go in many, (but obviously not all), cases.
When someone does not perform the necessary thought process of educating themslves, (to TTATT and reality in general), learning to think critically, and applying that education to a critical thought process, they are always in danger of going back, should another emotional wave, (usually of fear once again), force them back in. It is unfair, but it is reality.
d4g