The speaker of this short poem is asking for love, but doing it in a quiet, exposed way. They describe a weak spot in themselves, a "fault line" where their vulnerability seems to give way to taking, as if the openness they feel has been used or drained before. There's no "crevice" left, so nothing remains that could patch the damage. The speaker feels broken open and without their own remedy.
Then comes the request: "Will you be my snowflake... / And fall for me?" The snowflake is a gentle image. It's small, soft, and drifts down slowly, and it could settle into a crack and fill it. The pun on "fall for me" turns the weather image into a plea for romantic love. The title name, Jack Frost, adds a wintry touch, and the mood is tender, fragile, and hopeful, with a little uncertainty in the trailing dots and the final question mark.