Not all relationships break down in the same way
Some leave a relationship and say little, others end in anger.
Some may save or speed up the relationship. Duck said the model was too simple and added some stuff to it.
Progression from one phase to another was not inevitable.
It is possible to return to an earlier phase at any time.
He also added a 5th phase called “the resurrection phase”.
This is when ex-partners focus on future relationships using experience from past relationships.
This highlights problems with duck’s original model.