Is it strange that my girlfriend and I sit in silence when we go out?

We have been together for 5 years and whenever we go out to eat or on a date we tend to just have small talk and not talk much. Is that normal? It’s as if we ran out of things to talk about. We talk daily so we’re usually always up to date with our lives.
Is it strange that my girlfriend and I sit in silence when we go out?
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