That paranormal feeling of internal warmth we get from just being each other's presence.
They don't know how we would care about each other.

The way we would lose sleep worrying about the other's mood and constantly, almost forcefully, ordering the other to eat healthy, sleep more or whatever the case may be.

They don't know how we look at each other.

To look into her eyes and and think to myself, "She's beautiful", each and every time.
They don't know how many problems and obstacles we've overcome.
To think about everything that has happened, and to pick ourselves back up together and learn from past mistakes.

They don't know us.