"things" do not come between people, per se. what comes between people is space, and what ghosts the space is what you watch for. but it's a weary watch because you can't see ghosts (this is not ghost dad or casper, this is much less marketable or hi-five-y than that).
it's why "snow crush killing song" is practically narcotized; it's why "i know you're changing, god damn you for that," is delivered with the downcast eyes of a resignation. and where's the horror? some day that ghost will make itself manifest. and you kick quietly, because it's in your nature to kick when circumstance and time wrests something good from you, but you're sorta kicking against warm air, and the kicks get slower, and eventually, you just rest on this premonition, and eventually it comes true, and you'd been plopped on your ass quivering for the day.