WS's and Self Esteem

I often see where issues with self esteem are a common problem with WS's and contribute to affairs. I'm interested to understand how a WS who has identified self esteem issues as a contributing factor in their choice to have an affair, can rationalize the affair given the negative effects the affair has/will have on their self esteem. My thinking surrounds the deception and betrayal aspects of the affair and their negative impact on self esteem. For me it's not logical or rational thinking but maybe I'm wrong.

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