Do people ever feel threatened by a significant other's intelligence?

My girlfriend keeps telling me how smart I am. True or not, its what she says. I personally feel like she is just as smart as me if not smarter. But sometimes I worry that she may feel threatened by it. Just by the way she looks sometimes when I say something she deems “smart”.

I sometimes don’t say things that I may find interesting about a topic for fear of her thinking “How does he know all this stuff?”. Even though she herself baffles me sometimes with stuff she knows, I never feel threatened in any way.

Have any of you felt threatened by a partner’s or even friend’s intellegence?