This paper is cited on the Wikipedia page for the Big Five:
Big Five personality traits and relationship quality: Self-reported, observational, and physiological evidence (2008)
Wikipedia: Big Five personality traits – Romantic relationships
But also:
Personality and mate preferences: Five factors in mate selection and marital satisfaction (1997)
The Big Five and enduring marriages (2005)
Big Five personality and relationship satisfaction: actor, partner and similarity effects (2010)
Personality traits and mental divorce (2011)
A study of the relationship between Big-five personality traits and communication styles with marital satisfaction of married students majoring in public universities of Tehran (2011)
These papers refer to other studies also.