Source

The costs of family and friends: an 18-month longitudinal study of relationship maintenance and decay

peer-reviewed longitudinal study Roberts and Dunbar, 2011, Evolution and Human Behavior 32

Claim this source supports

“Friendships, unlike kin ties, decline in emotional closeness without ongoing contact and shared activity”

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Cited in

Most Friendships End Without a Decision — video poster frame

1:13

Behavior

Most Friendships End Without a Decision

Friendships are held together by ongoing inputs — shared proximity, unstructured time, reciprocal attention, and low-cost opportunities to be present.