I heard about a Chinese or Cantonese movie from the late nineties the other day; didn’t watch it, though. I can’t remember its title, but I think it had something to do with two couples experiencing unfaithful relationships, and the two who are cheated on come into contact and actually fall in love, I think.
Not Chinese, but I’ll try anyway : Wong Kar Wai’s “In the Mood for Love”.
http://www.imdb.com/title/tt0118694/