Eventually expansion will tear apart the nuclei of atoms. Eventually, each fundamental particle will be so far apart in expanding space that even if traveling towards one another at the speed of light they will never meet.
Each fundamental particle will, in a practical sense, be alone in the universe. Nothing in any direction forever.
Currently gravity overcomes expansion at local group galactic (and you and me) levels.
What’s the difference between space expanding between stellar objects and me and the coffee cup, since you cite that: “Eventually expansion will tear apart the nuclei of atoms”?
I have no idea what you are made of, but I assume like the rest of us, you are made up of atoms which will eventually be torn apart by expansion. All of which I said in my original post - just not in those words.
And yes, during the course of a morning typing all this stuff, my coffee cup has a mysterious way of getting further away somehow, worse, every once in a while the liquid inside seems to vanish, forcing me to move further from my desk and into the kitchen for more of the liquid (dark energy at work, perhaps?).