The 80/20 rule in relationships is based on the premiss that, in a good relationship one can only achieve 80 percent of what you need or want out of the relationship. The rest is unattainable and can only be found in other partners. Which means our partners provide 80% while the other 20 is out there just wanting on us to fulfill our dreams and achieve ultimate happiness. Some people agree with this rule, some do not. The argument is that in any relationship it takes two to make it work, one cannot simply rely on the other to deliver that 80%.