They're not secrets anymore. :)

2) Five To One

How many good moments do you need to make up for the bad ones? Research has a ratio for you: 5 to 1.

You don’t need to count every single positive and negative but if they’re nearly equal, your chance of divorce shoots way up.

Via For Better: How the Surprising Science of Happy Couples Can Help Your Marriage Succeed:

As University of Washington researchers reviewed the data, a striking pattern emerged. In stable marriages, there are at least five times more positive interactions than negative ones. When the ratio starts to drop, the marriage is at high risk for divorce. In real life, no couple can keep a running tally of positive and negative displays. There are hundreds of them that happen in any given day. But in a practical sense, the lesson is that a single “I’m sorry” after bad behavior isn’t enough. For every snide comment or negative outburst in a marriage, a person needs to ramp up the positives so the good-to-bad ratio doesn’t fall to a risky level.

(Here’s more about 5 to 1.)