Lovely, William. Your quiet rhyme and meter snuck up on me when I read it aloud.
This poem, and the relationship within it, has a feel that is both intimate and remote -- much like the stars you've used as a metaphor, which can feel so close even though they're light years away, and feel so tiny and cold, even though they are huge and burning.
I see these two (metaphorically speaking) in a boat lost on the ocean on a cold winter's night, she looking into the night toward their future, he hating what she sees and wishing for something else, and yet all the meaning in his universe has shrunk to so many glittering droplets of frozen mist that cluster around her face. Looking at your title, I see the pair headed somewhere colder still, and it is she who is steering it that way.
I particularly love your second and fourth stanzas. The meaning of words between them hangs in the air like stars, appearing from a distance to coalesce in galaxies -- though in reality standing alone, vast distances apart -- too remote to make out anything about them but their existence, thus remaining cold and mysterious, their secrets forever untold. Then too, it makes me think of their breath hanging visible and commingling in the cold night, clinging in tiny dewdrops to her hair.