A four-year study of 135 young couples has found that split-second, 'visceral' reactions about their partner are important, too. The results show that these automatic attitudes, which aren't nearly as rosy as the more deliberate ones, can predict eventual changes in people's marital happiness, perhaps even more so than the details that people consciously admit.

Source: Nature News

This probably explains why you read a news like this:

Before the incident, Graham had informed a friend that she was having second thoughts about the marriage. And at some point that on the evening of his death, Graham texted her friend: "Oh well, I'm about to talk to him."

Do you even PubMed?