Because it was too painful to think about how his marriage had fallen apart due to his wife's infidelity, russell decided that he was not going to remember anything about his marriage. russell is trying to use a form of motivated forgetting, to ease his pain.

suppression

Explanation:

In a psychological context, suppression refers to the act of restricting oneself from feeling or doing something. Motivation suppression led an individual to abstain from engaging in an activity. However, it has negative effects too because when an individual holds his feelings, they return with vengeance. As per the question, Russell suppresses the memories of his marriage to eliminate the feeling of pain because of his marriage breakdown.

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