One problem with research examining relationship breakdown is the reliance upon restrospective data.
This means that the questionnaires or interviews used to asked participants about the breakup occur sometime after it happened
Peoples memories of the event may not be accurate, and may also be distorted by their current situation, which means that their answers may not be reliable.
As a result, it seems to be supported by research, does not necessarily describe how break ups happen in real life, weakening the model’s ability to present an accurate picture of relationship breakdown.