Characters
Elizabeth, I should have told you every day from the moment I met you: I love you.
— Will Turner · Pirates of the Caribbean: The Curse of the Black Pearl

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The declaration of love also acknowledges all the occasions when it went unsaid. Every day since their meeting becomes a measure of what the speaker now thinks he should have expressed. The line joins affection with regret, making the present confession carry the weight of those missed words.
Context reviewed