A one from day one
The only person who never gave up on you, even when you acted like the world was ending every single day.
My one from day one never gave up on me, even when I cried over a broken pencil.
Since day one, she’s been there, even when I acted like the sky was falling.
He’s been with me since day one, even when I thought the world was going to end because of a bad haircut.