What if the couple falls out of love with each other and are totally miserable? They should stay together regardless of any emotional pain?
Should our feelings dictate our behaviour?
What if the only way I can be happy with you is to treat you with great disrespect? Should I? Or should I submit to inherently right behaviour and treat you with the respect that you need as a human being?
First they should repent of the sin of not loving one another.