When it comes to on-off celeb couples, few are as, um, on-off as Nicholas Tse, 40, and Faye Wong, 51.

It doesn't help that they are so determined to stay off the radar (and who can blame them?), they've only been spotted out in public a handful times over the course of their 21-year roller coaster relationship.

It's for this reason that the couple is almost always dogged by breakup rumours.

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