Marriage is a sacrament/ Precious Blood. God made it, not man. Marriage is a supernatural union. Anything else is of man. This husband is still married to his wife whether she likes it or not. The husband must pray for her to repent and for her return. The return, if it should happen, depends upon the situation how they will unite, maybe as brother and sister, in their actions. But rejection is the worst! It is worse than death of a spouse. The world makes it to easy, the no fault, like it or not attitude and give me half, how sick!!
As catholics, we believe in no remarriage, so she is not getting what she wants. She thinks with the devil. We also believe in forgiveness of sin and again, the victim needs prayers for themselves as well. The wife could come to her senses and be very repentant, like Mary Magdalene.
If I were the husband, I would ask for all the Communion of Saints to help me in prayer. Then I would beg for the Precious Blood. If she were to return, she would have to have a check-up for any STD's! You have to! When the spouse does this, some times they are working and listen to gossip and talk that lead them to the devil. Once they start, they feel dirty and then they feel no way out. Next is ѕυιcιdє. Yes, ѕυιcιdє for the wife who wants to make a split. Victims hurt so bad, so very bad. Know that Christ had rejection. Prayers!!