Marriage Rates

Although divorce rates have held more or less steady for the last few years, the reason is because less people are getting married. Pew Research Center reports that the number of both men and women who have never married is at record levels and growing. 

The reason isn't because people are becoming loners given that, "about 24% of never-married Americans ages 25 to 34 currently live with a partner." They are just choosing not to marry. I cannot find good data on why but a good bet would be that risk and cost of divorce is part of the reason.