The Last To Know

Standing alone in solitude
Holding your head in your hands
Tears play like rain on your fingertips
Who but yourself is to blame?
How could I offer sympathy
When all I feel is pure rejection
I was the first one to really know your name
And you were the first one for me
But everyone knew but me
You were the first one to ever let me down
And I was just THE LAST TO KNOW
I was the fool who trusted you
No evil thoughts in my mind
When I see you standing there with him
(actually, «When I saw you going out with him»)
Who can I blame, for this deception?