He is dating a married woman
In some societies, especially historically, a concubine was a woman who was in an ongoing, usually matrimonially oriented relationship with a man who could not be married to her, often because of a difference in social status.The term wife is most commonly applied to a woman in a union sanctioned by law (including religious law), not to a woman in an informal cohabitation relationship, which may be known as a girlfriend, partner, cohabitant, significant other, concubine, mistress etc.However, a woman in a so-called common law marriage may describe herself as a common law wife, de facto wife, or simply a wife.Those seeking to advance gender neutrality may refer to both marriage partners as "spouses", and many countries and societies are rewording their statute law by replacing "wife" and "husband" with "spouse". The status of a wife may be terminated by divorce, annulment, or the death of a spouse.In some cultures, it was paid not only to support the establishment of a new family, but also served as a condition that if the husband committed grave offenses upon his wife, the dowry had to be returned to the wife or her family; but during the marriage, the dowry was often made inalienable by the husband.Today, dowries continue to be expected in parts of South Asia such as India, Pakistan, Nepal, Bangladesh, and Sri Lanka, and conflicts related to their payment sometimes result in violence such as dowry deaths and bride burning.
However, this practice was curtailed to a great deal in many countries in the twentieth century, and more modern statutes tend to define the rights and duties of a spouse without reference to gender.
In many cultures, marriage is generally expected that a woman will take her husband's surname, though that is not universal.
A married woman may indicate her marital status in a number of ways: in Western culture a married woman would commonly wear a wedding ring but in other cultures other markers of marital status may be used.
A wife is a female partner in a continuing marital relationship. The term continues to be applied to a woman who has separated from her partner, and ceases to be applied to such a woman only when her marriage has come to an end, following a legally recognized divorce or the death of her spouse.
On the death of her partner, a wife is referred to as a widow, but not after she is divorced from her partner.