Young adults today probably meet and interact with many fewer people in person than most any generation in the past 50+ years. Romantic relationships, especiall

Young adults today probably meet and interact with many fewer people in person than most any generation in the past 50+ years. Romantic relationships, especially casual ones, are probably largely the result of meeting lots of people in person. They spend less time around people in general due to social media and whatever else they have. There's also probably some element of narcissism that exists today that didn't previously due to social media (and I apply this to all age groups). Seems like a pretty simple explanation to me.