What does "loveless" mean? Do they dislike or hate each other, or just not feel that spark/whatever anymore? And is mutual, or is it just your friend? Is the

What does "loveless" mean? Do they dislike or hate each other, or just not feel that spark/whatever anymore? And is mutual, or is it just your friend? Is there an incident that led to this? As an older person, it'd be tempting to just live as friends and/or give it a while to see if it picks up again. Experience suggests, though, that there's more under all of this and that things will fall apart. I wish them luck.