[Drew68]

Couples living together for years - out of wedlock - who then get married split up at alarming rates.

Happened to a couple I know really well. Lived together for over a decade and were divorced before their first anniversary.

[RexBeach]

Strange, isn't it? All that time together, and then, after they wed, it's Splittsville. I'm sure there's an explanation for why this happens so frequently, but I'm at a loss to grock it.