Grief no one else sees
There is no obituary line for what you were to each other.
Nobody sent a casserole. There was no seat reserved at the funeral, because you were not on the list of people who got told, or you were told and had nowhere you were allowed to stand. The person mattered to you enormously and the world around you had no seating chart for that kind of missing.
This happens more often than it gets talked about. An ex you have not spoken to in a decade, whose death still knocked the floor out from under you. A colleague you sat next to for ten years, closer some days than anyone at home, whose funeral you were not sure you were invited to. A patient whose name you knew before you knew their diagnosis. A person you loved and never told anyone, so no one knew to check on you when they died. A public figure who got you through something you never explained to anyone. A relative you were estranged from, so that the grief arrived tangled up with everything unresolved between you.
Grief without a permit
None of these losses come with a form that grants you time off, or a card, or someone asking how you are doing at the right moment. The relationship existed in a place other people could not see, so the ending of it is invisible too, and you are left doing the arithmetic alone: how much you are allowed to feel, given how little the world thinks you had a claim to.
The secret ones are their own particular weight. You cannot mention the loss without also revealing the relationship, so you say nothing, and grieve on a schedule that has to fit around ordinary conversation: composed at work, composed at dinner, and then falling apart alone in the car for reasons a coworker would not understand even if you tried to explain them. There is no announcement to make. There is only the private fact of it, carried without an audience.
There is no such arithmetic that holds up. Grief tracks the size of the bond, not its paperwork. A complicated relationship still leaves a real loss behind, and a relationship no one else knew about is no less true for having been private.
Saying it anyway
Most of the exhausting part of this kind of grief is managing other people, deciding what to explain, calibrating how much of the truth a given person can hold. A Wind Phone does not need any of that managed. There is no one to explain the relationship to first. You can pick up the receiver and say what is actually true, including the parts you have never said to a living person, and whatever was left unsaid between you can go here too.
The permission you were waiting for was never going to come from outside. It was always going to have to come from you.
Say what you need to say. The line is connected to nothing: no one hears you, nothing is recorded, nothing is stored.