Movies and Marriage
and Le Week-End. (Hanif Kureishi, Roger Michell) Both good, but not too cheery!
I only know of yellow- and white-, not blue jasmine per se, but guess the reference might be to the clematis crispa rather than to plumbago or Petrea? Being a woody climber and southern bell(e)...
"Since the late twentieth century, major social changes in Western countries have led to changes in the demographics of marriage, with the age of first marriage increasing, fewer people marrying, and many couples choosing to cohabit rather than marry. For example, the number of marriages in Europe decreased by 30% from 1975 to 2005."
(From wiki entry on marriage.)