Samuel broke up with his boyfriend after a fight. He has spent the last week repeatedly going over the fight in his mind, which has caused him to sink into depression. His continual reliving of the fight is known as .

rumination      

Explanation:

Rumination, in psychology, is described as an individual's focused attention related to the symptoms of his or her distress and its related possible consequences and causes and is opposite to its specific solutions that are associated with the "response style theory" which was discovered by Nolen-Hoeksema during 1998.

The correct answer for the question above is rumination.

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