All men know that women suffer from mysterious and unfathomable ailments, fancies and upsets. Men just shrug and accept this reality. They don't want know the details (unless they are very creepy men indeed), being very squeamish, even if they are covered in thick dark hair and grunt instead of conversing.

Consider saying how sorry you were to miss the party and hope he had a good time. He will fall back on his instincts and know what to do.