One recent study of 373 newlywed couples, for example, found that couples who yelled at each other, showed contempt for each other, or simply began to disengage from conflict within the first year of marriage were more likely to divorce, even as far as 16 years down the road.
So why are couples who exhibit this one behavior more likely to split up?
It comes down to a superiority complex.
Feeling smarter than, better than, or more sensitive than your significant other means you're not only less likely see his or her opinions as valid, but, more important, you're far less willing to try to put yourself in his or her shoes to try to see a situation from his or her perspective.
Picture a resonance chamber, suggests Gottman, with each person in the relationship a source of his or her own musical (or emotional) vibrations. If each partner is closed off to the other person's vibes (or emotions) and more interested in unleashing their own feelings of disgust and superiority, these negative vibrations will resound against one another, escalating a bad situation "until something breaks," Gottman says.
If you've noticed yourself or your partner exhibiting this type of behavior, don't despair — it doesn't mean your relationship is doomed.
Being aware that you're doing something that could negatively affect your partner is the first step to actively combating it. If you can figure out how to avoid the behavior or replace it with a more positive one, you'll likely greatly improve the relationship — and increase your chances of staying together for longer.  

Read more: http://www.businessinsider.com/one-behavior-is-the-kiss-of-death-for-a-relationship-2015-1#ixzz3SCHgTFBQ