|You'd better like how your fiancée feels, because they'll be|
your emotions soon enough! From Public Records Search.
Compared to data of random pairs of men and women, married couples show a closer link in happiness. Hoppmann says, "Not only did spouses report similar levels of happiness when they entered the study, but when there were changes in happiness in one spouse, that did have an effect on the other spouse as well." These effects may take place because spouses share many of the same experiences and same stressors.
The study does leave room for speculation, however, because it did not look at same-sex marriages or long-term unmarried couples, though Hoppmann theorizes that the results would likely be the same.