Where did I go wrong?

I would ask you
But it's been a little too long
A question I want answered:
Where did I go wrong?

Was it when my grandfather died
And I let you steal my heart away?
Or when you said that you loved me
And I didn't know what to say?

Was it because I hit you
For trying to go a little too far
And then, after we apoligized
I simply climbed into my car?

Was it because I left
The night you got too drunk
And I told you that I couldn't believe
How low you'd sunk?

Was it when you told me what you'd done with her
And I simply turned away
Because you'd left me so upset
I didn't know what to do or say?

Was it when I said I'd go out with you
Or was it before then?
When everyone warned:
"Kate, don't date your best friend."

Sure, I messed up
But you did, too
No matter how many times you deny it
You know it's true.

I've realized, writing this
That I no longer love you after so long
But I still want to know
Where did I go wrong?