Depending on your generation, you have your own quintessential examples of relationship churning. Gen Xers asked whether Friends’ Ross and Rachel were really on a break. Millennials sang along to Taylor Swift’s “We are never, ever getting back together” and parsed whether Khloe Kardashian had gotten back together with Tristan Thompson (she did, but they broke up again). Yet, research on romantic relationships all-too-often treats couples as easily categorized as together or separated.

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