The last time we kissed was two years ago.
I didn't know it would be our last
I think I would have done it differently if I did
A fleeting peck right before I left?
That's not how I wanted our last moment to be
Hell, I didn't want us to have a last moment,
But we did.

If I had known, I would have held on  a little longer
I would have wrapped my arms around you
As if the Titanic just sank
And you were my lifeboat
I would have kissed you like I meant it, like I mean it
So even if I couldn't see it, I would have felt you smile
I would have held on a while longer
I would have hidden in your embrace
I would have shown you exactly how I loved you, how I love you
I would have touched the sides of your face
I wouldn't have let you go.

I didn't know it would be the last time you looked me in the eyes.
I wouldn't have blinked.
It hurts to think of how you despise me
I would have looked right back
Because even though I know a look can't apologize for the lies,
I would have tried.

I didn't know it would be the last time you touched me.
It was only your hand on my arm,
But it sent shivers down my spine
If I had known, I would have grabbed your hand
I would have held it and kissed the fingers
I would have stood still to let the moment linger
I would have hugged you so tightly
'Cuz home is where your heart is,
So I belong by your side
I would have listened for the steady rhythm of your hear
As if it was trying to escape your chest
To complete mine.

If I had known it would be our last kiss,
I would have stopped time.
I would have paused that instant before the next came
If I had known then, I wouldn't have walked away
Leaving behind only a promise that that kiss wouldn't be our last
There's enough proof in the past to say I was wrong
All along, I had a hard time keeping my word

If I had known it was our last moment together, I would have turned back
I would have seen the "I love you" leave your lips
I've heard you say it over and over before
But I guess I never really listened
I wouldn't have missed the chance to really say it back

That was over two years ago.
I didn't know that kiss would be our last.
I KNOW I would have done it differently if I did.
I would have made putting up with me worth it,
I never wanted us to have a last moment,
But we did.
If I had known...
I would have made it perfect.

More often than not,  you regret what didn't happen more than you regret what did.