A study of "partner abandonment" revealed that husbands are six times more likely to leave sick wives than wives are to leave sick husbands. "Men have a much harder time being caretakers than women do," Sember observes. "Men find it hard to juggle that kind of responsibility, particularly if the wife has always been the one to fill that role." Moreover, "often women are more able to take time off from work to care for an ill spouse than men are."
MJ Glantz et al. (2009). Gender disparity in the rate of partner abandonment in patients with serious medical illness. Cancer, 115 (22).
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You are NOT alone. Three-quarters of marriages affected by chronic illness end in divorce. The statistic is roughly 90% when the sick partner is the wife.