How Long Has This Been Going on Lyrics

I could cry salty tears
Where have I been all these years?
Little wow, tell me now
How long has this been goin' on?

[ Lyrics from: http://www.lyricenter.com/e27494-carly_simon~how_long_has_this_been_going_on_lyrics.html ]
There were chills up my spine
And some thrills I can't define
Listen sweet, I repeat
How long has this been goin' on?

Oh, I feel that I could melt
Into heaven I'm hurled
I know how Columbus felt
Finding another world

Kiss me once, then once more
What a dunce I was before
What a break, for heaven's sake
How long has this been goin' on?