“Perhaps couples that meet through friends and family feel more pressure to stay together” My first thought. When your support networks/social networks are int

“Perhaps couples that meet through friends and family feel more pressure to stay together” My first thought. When your support networks/social networks are intertwined there’s a big disincentive to split up, knowing it’s going to have a big and possibly damaging impact well beyond just splitting with a partner. Also - bringing your families and friends together may add more friction if you wouldn’t have met offline.