What if one spouse develops an incurable disease or handicap that does not allow a normal married life? Can the other spouse go for divorce?
The sickness could very well have come to the other spouse! One of the reasons why God puts two people together is that if one becomes needy the other can provide the support. It is, of course, one of the commitments the couple makes in marriage that whatever good or bad happens, they are going to stick it out together. One must believe that God will give special grace in special situations.