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I have a hunch that a large fraction of those cases, the couple should probably have got divorced years previously but were sticking around out of inertia, and that the really depressing number in this statistic is actually how low the rate of women leaving is.
(I'm not going to defend 20.8% as at all reasonable, and abandoning an otherwise good relationship because your partner gets cancer is obviously incredibly shitty, but some people really should get divorced and I have some sympathy for cancer being the "Nope, can't deal" moment)
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