Do-do-do-do...
She was my once in a lifetime
Happy ending come true
Oh, I guess I should have told her
I thought she knew
Do-do-do-do...
She said I took her for granted
That's the last thing I would do
Whoa, I'll never understand it
I thought she knew
I thought she knew
My world revolved around her
My love light burned for her alone
But she couldn't see the flame
Only myself to blame
I should have known
I should have known
Do-do-do-do...
A heart full of words left unspoken
Now that we're through
Well, I'd sell my soul
To have this side let spoken
Oh I thought she knew
I thought she knew
My world revolved around her
My love light burned for her alone
But she couldn't see the flame
Only myself to blame
I should have known
I should have known
Ooh...
She was my once in a lifetime
Happy ending come true
Whoa, I guess I should have told her
But I thought she knew
I thought she knew
I... thought she knew (I thought she knew)
I thought she knew
Ooh...
I... thought... that... she... knew...
Knew-knew-knew-knew...
Knew-knew-knew-knew...
Yeah