(I Don’t Know Why) But I Do di Clarence “Frogman” Henry è il terzo dei brani dalla colonna sonora di Forrest Gump.

Scritta da Paul Gayten e Bobby Charles, è stata quarta nella U.S. Billboard Hot 100 per l’anno 1961.

Il “sound allegro” nasconde un testo piuttosto triste:

I don’t know why I love you but I do
I don’t know why I cry so but I do
I only know I’m lonely and that I want you only
I don’t know why I love you but I do

I can’t sleep nights because I feel so restless
I don’t know what to do, I feel so helpless
And since you’ve been away, I cry both night and day
I don’t know why I love you but I do

My days have been so lonely
My nights have been so blue
I don’t know how I manage, but I do

Each night I sit alone and tell myself
That I will fall in love with someone else
I guess I’m wastin’ time but I’ve got to clear my mind
I don’t know why I love you but I do