I believe that there is no perfect marriage, no perfect couple. which marriage has a sacred promise of both couple that for better or for worse for richer and for poorer til death they were part. both of them should adjust and accept their weaknesses. after all, before they get married, first the boy courted the girl without knowing all of that person. so if you accept all the changes of your married life, one should adjust and give their best to make that marriage life works.
Your statement doesn't make any sense. If a couple is not capable of living in peace, then they should separate. Else, it will only give rise to more and more troubles. But the most important thing to remember here is that they should think about it a hundred times before taking the decision to break-off.