opposite of wife. verb.
in order to unwife a woman, a male human first has to wife her. he wifes her by declaring her his wife, as opposed to his girlfriend, mistress, etc.
once he has found someone else to come home to, the male will unwife the wifed woman in much the same lack of ceremony in which he initially wifed her. whether he tells her, or whether he waits until she asks him, is a question of his integrity, honor, and hustlership. a more experienced male, aka Man, will be ceremonious about it. a small scale wanna-be thugster will clandestinely switch and let the "bitch" find out.