Fear of what life would be WITHOUT YOU !!!! Fear of living without you... Fear of losing you... It is part of this madness.. Which is why they are oblivious to the mess they cause.. the hurt their departure creates. they feel the same pain. the confusion of whith and without.. wanting it and not wanting it.. whatever " it " is..
I remember you mentioning that your ex talks like YOU AND YOUR KIDS abandoned him.. My ex do the same thing.We didn' t leave him, he left us ( but won' t let us go ).. like your MLCer..
I don' t think it is all about this fear but I believe it is a HUGE part in a MLCer dilemma.