60 People Thought They Would Be Inseparable With Their Friends For Life, But Couldn't Have Been More Wrong

Robin Dunbar, the Oxford anthropologist behind the famous "Dunbar's number" of 150, says our social lives come in layers. There are about 5 people in your innermost circle, 15 in the next ring, 50 after that, and 150 at the outer edge.

Most friend groups live in that 5 to 15 zone, so losing the group doesn't cost you one friend. It wipes out an entire layer of your support system in a single afternoon. Dunbar also found that friendships need constant upkeep, and without regular contact, they slide down a tier and keep going.

Rebuilding that layer is a project of its own. Jeffrey Hall, a communication professor at the University of Kansas, measured how long friendship takes to form in a 2018 study. It takes about 50 hours together to go from acquaintance to casual friend and around 90 hours to become an actual friend. Close friend territory starts past 200 hours. That's five full work weeks of hanging out, which explains why starting over feels so exhausting.

The pain of being dropped is physical, and scientists have the brain scans to prove it. Psychologist Naomi Eisenberger and colleagues put people in an fMRI scanner during a virtual ball-tossing game called Cyberball, where the other players suddenly stopped throwing to them.

The anterior cingulate cortex, a region involved in processing physical pain, lit up. Kipling Williams, who created the game, found that people still felt the sting even when told the other players were computers. If a cartoon ball can do that, a group chat with a new name has no chance.

So why does the entire group go along with it? Solomon Asch's conformity experiments in the 1950s are a good starting point. About 75% of participants went along with an obviously wrong answer at least once, just because everyone else in the room had said it first. Asch also found that a single ally who broke from the pack made people far more likely to speak up. In a friend group, that ally usually isn't there, and everyone assumes someone else will say something.

Social psychology has a few more explanations for how it spreads. Fritz Heider's balance theory, from 1946, says people feel tension when two friends disagree about a third person, and that they tend to resolve it by lining up with whoever they're closest to.

Then there's the "black sheep effect," documented in the late 1980s by researchers including Jose Marques, which found that groups judge a disliked member more harshly than they'd judge an outsider doing the exact same thing. Put them together, and one bad story can flip a whole group before the person at the center knows there's a story.

You are far from the only one sitting in an empty chat. The Friendship Recession reports that 17% of Americans say they don't have close friends, up from 3% in 1990. The number of people with ten or more close friends fell from 33% to 13% over the same period. Men fared worst, with 15% reporting no close friends at all. Loneliness is spreading fast enough that US Surgeon General Vivek Murthy issued a formal advisory on it in 2023.