Robert and Cora Crawley have their disagreements and issues (especially in season two), but overall have a loving relationship. But even if the marriage was in shambles, it's unlikely Cora would leave Robert due to the rules of marriage and divorce during this time. If a husband cheated on his wife, this wasn't grounds for divorce unless he left her as well. But not the case if the roles were reversed. Women who cheated on their husband could be divorced easily. And however it began, women would always be left high and dry after the split, with men getting sole custody of the kids and all joint money.
Married or Bust
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