He had seen a vision of a man of Macedonia asking him to come over and help. But when he got to Philippi Paul discovered that the man of Macedonia was really a woman. After a few months Paul might have seen the new model of marriage in action when he stayed with Priscilla and Aquila in Corinth. But we are only guessing, and we will never know exactly how God managed to transform Paul's attitude to women. Jesus very delicately does not refer to women in this situation because patriarchy assumed that no woman should even look in the direction of another man.
Men can look wherever they please.
In the patriarchal model only the husband was allowed to divorce his wife, and that could be any time and for the most trivial of reasons. In this and the parallel texts in Matthew a quite new meaning of adultery emerges. If however the woman has been unfaithful, then the mutuality of the marriage is already adulterated. But in contrast to the patriarchal model of marriage, polygamy is in any case rejected. On any model of marriage we have the very problematical text in the Sermon on the Mount.