Characters
We both might face the facts that neither of us has proved to be a very great success as a wife.
— Margaret · The Philadelphia Story

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker urges frankness between two women who share the same shortcoming: neither has made a good wife. It is a blunt, faintly rueful self-assessment that folds herself in with the other person rather than singling them out, treating shared failure as something better admitted than dodged.
Context reviewed