Answer:
This cognitive distortion is known as personalization.
Step-by-step explanation:
Cognitive distortions are the result of an irrational thought that comes after a negative feeling. As the name states, they distort or twist reality for an individual, making him/her see reality in a certain way unable to understand that it is not exactly reality.
Personalization occurs when an individual relates external issues with him/herself without general proof or a base.
In this case, Natalie is blaming herself entirely for the breakup, relating external causes to herself without proof, thinking if she had done something different she wouldn't be alone.