Why Is It I Am The Last To Know

It crossed my mind 
Why is it I'm the last to know
And later on,
I saw you in the corner dancin'
So close to him, so satisafied, just movin' slow
I got a shock at first 
Then all at once, it hit me
I asked myself, why is it I'm the last to know
Its time to leave and though your standing here beside me
Your looking back at him
Just like you hate to go
Somewhere along the way
I don't know how it happened
I lost your love 
Why is it I'm the last to know
I asked myself, why is it I'm the last to know