These are a few of the lyrics from the song We Belong Together:

I didn't mean it when I said
I didn't love you so
I should have held on tight
I never should have let you go
I didn't know nothing,
I was stupid, I was foolish
I was lying to myself
I could not fathom that
I would ever be without your love
Never imagined I'd be sitting
Here beside myself
Guess I didn't know you
You'd guess I didn't know me
But I thought I knew everything
I never felt

The feeling that I'm feeling
Now that I don't hear your voice