According to the leading research done by the Gottman Institute, there are four deadly habits in couples that lead to unsuccessful relationships and are damaging to the core of the bond two people have. If you have more than two of these, then you are headed towards failure in marriage and relationships. By identifying these and working on them individually and as a couple you may overcome them and have a healthy relationship. By replacing any of these habits by something positive will make a huge difference with your partner.