Breaking Up is Hard to Do, Unless Everyone Else is Doing it Too
This research found that divorce can spread between friends, siblings, and coworkers. It also extends to two degrees of separation. The process it like this: A divorcing person confides in a married friend. That married friend may not decide to split with his spouse, but tells details of the conversation about the divorce to a third party, influencing that third person to get a divorce.
Scary, but real stuff. The research was supported by the National Institute on Aging. Read the whole study here.