During a 26-year study, psychologist and author John Gottman, PhD, discovered why married couples fail or succeed. It came down to this simple fact: Couples who maintain a five-to-one ratio of positive to negative interactions usually succeed. Those who fall below a one-to one-ratio usually fail.
Surprisingly, even if the relationship had a lot of other problems, this one fact still held true. So, even volatile couples, or couples that tend to avoid conflict can still succeed.
via: Avoid Divorce with the 5:1 Ratio