Our expert says:
I really sounds as though you have inflated this small event into something awfully big. I don't see the faintest reason to be worried. Yawning is also related to physiological things like blood gases, and to general tiredness --- we often yawn without necessarily wanting to go to sleep, and without being awfully bored. As Maria says, only your gf can answer that question, and, as it was probably not significant to her, she may not even remember why.
As it happens, I yawned while typing this response. I am not hungry, not going to sleep, and not at all bored with either your question nor with my answer to it !
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