There was an old adage that the closer a guest was to royalty, the more carefully you should count your silver when they've left.
I feel similarly about couples who make a song and dance about how utterly and exclusively committed they are to one another....
At the third mention of eternal bliss and the absolute impossibility of ever looking at another, I think "Is he visiting hookers or is she having an affair with his best friend?"
Sadly, my wife thinks similarly. We are a cynical (if eternally devoted) pair.
Come to think of it, why has my best friend been staying so much recently, and always when I'm away?