Conversation so far:
what was Hearst's relationship with Marion Davies?
William Randolph Hearst and Marion Davies lived as a couple for decades but were never married.
why didn't William Randolph Hearst and Marion Davies marry?
William Hearst's wife refused to give him a divorce.

Question: Why didn't he divorce her?
Self-contained rewrite: Why didn't William Randolph Hearst divorce his wife?