Why is my boyfriend acting so weird after introducing his family to me?

Anonymous
Over the Christmas holiday, my boyfriend and I have been hanging out almost every day.
He invited me to have dinner with his family for the first time on Christmas day, which went pretty well as his parents seem to like me a lot. However, since then whenever I talk about that family dinner with him, he would always look uncomfortable and try to change the topic. Why is that?
Why is my boyfriend acting so weird after introducing his family to me?
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