What aspect of his wife did the husband express regret about?

The husband's expression of regret about the aspect of "the deception" indicates that he is acknowledging a significant breach of honesty that may have affected the foundation of their relationship. Regret regarding deception often suggests that the husband feels remorse for not recognizing or addressing the dishonesty earlier. It implies an emotional weight tied to feelings of betrayal and the impact that dishonesty can have on trust and intimacy within a marriage. This choice reflects an understanding that deception can cause deeper issues that might lead to further regrets, possibly influencing how both partners view trust, faithfulness, and the overall state of their relationship.

In this context, focusing on deception highlights a core issue that directly contributes to any turmoil or challenges they are facing, emphasizing its centrality to the husband's feelings of regret.