The key difference between a wife and an affair partner lies in the nature of the relationship. A wife is a woman who is legally and emotionally committed to her husband through marriage, whereas an affair partner is someone with whom a married person engages in a secret, illicit romantic or s*xual relationship outside of their marriage.
An affair is a betrayal of the marital vows and the trust that exists between a husband and wife. It can have devastating emotional and psychological consequences for the spouse who is betrayed. In contrast, a wife is the life partner with whom one has built a committed, long-term relationship based on mutual love, respect, and fidelity.
While an affair may provide temporary excitement or fulfillment, it ultimately damages the primary relationship and can lead to the breakdown of the marriage. A wife, on the other hand, is the foundation upon which a healthy, lasting marriage is built.