It’s normal to want quiet time, especially if you’re spending a lot of time together. Constantly interacting can get exhausting, even if you love the person you’re interacting with.
Consider why you feel the compulsion to fill silence with words. Lots of people (especially these days, with the constant over-stimulation from media and devices) aren’t good at just… Being a person. Just existing without any particular purpose or reason. Simply being is uncomfortable for these people, so they feel the need to force interaction on whoever is around them as a distraction.
It’s no different than reaching for your phone the instant you start to feel bored. Even if you’re bored with your phone already, (already checked all your notifications, already tired of doomscrolling, etc,) it’s just peoples’ first reaction to being bored. Give me an easy distraction so I don’t need to think about how bored I am.