Where Were You When My Walls Came Falling Down

Where were you when my walls came falling down
You said that you would always be there for me whenever I needed you
That you would never leave me
Yet when my walls came falling down you were no where to be found
I trusted you and let you in
I told you things that I never told my best friend
But as soon as I told you that I was falling for you
You left you walked away you broke your promise to me
You've left me vulnerable and now I have no way to defend myself from anyone
Because all my walls are down and I don't know how to put them back up
Where did you go
Why did you leave me here all alone