Before you do, consider the large and growing body of scientific research on relationships: what strengthens and weakens them and what predicts long-term success versus dissolution. Below, we've put together a list of 17 nontrivial facts about relationships to consider before you hire a wedding planner. According to a study by the University of Pavia in Italy, it lasts about a year. After that, levels of a chemical called "nerve growth factor," which is associated with intense romantic feelings, start to fall. Helen Fisher, a psychologist and relationship expert, told Business Insider that it's unclear when exactly the "in love" feeling starts to fade, but it does so "for good evolutionary reasons," she said, because "it's very metabolically expensive to spend an awful lot of time focusing on just one person in that high-anxiety state.
Here's How Long 9 Couples Dated Before They Got Engaged
Dating 5 years and not married – Special Sources
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These Are The Real Reasons Your Long-Term Boyfriend Hasn't Proposed Yet
Gates wins a hand. And you are lucky in war," Guggenheim says, referring to the card game. In the documentary, which was released Friday, the year old centibillionaire is obviously grateful for his wife, Melinda. But perhaps that wasn't always so clear.