True answer (from a husband of 32 years): Go to bed and leave her alone. If she's grumpy tomorrow, ignore it--you get grumpy too about stupid things. If she stays grumpy for too long, you have the wrong girlfriend.
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Just realized that my advice might be obsolete, since we didn't share a bed until after we were married.
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Just realized that my advice might be obsolete, since we didn't share a bed until after we were married.