Why do we compare to other people's romantic relationships?

CONCEPTUAL

The idea that other people's lives 
are none of our business, that might have seemed disconcerting in the past,
is almost unquestioned today.
L’idea che le vite private degli altri
non siano affar nostro, che in passato
sarebbe apparsa sconcertante,
oggi è diventata un assunto insindacabile.