Secrets, lies and a whole lot of deceit

Well the title sums it up. I've written after a looong time so please comment and rate!

How you thought,
You had every secret well concealed.
But in those eyes,
You had every secret well revealed.
 
Like how you thought,
I’d never know about that girl.
But in your voice,
I heard, “She is my only real pearl.”
 
You also thought,
That you could pass her off as kin.
But from your touch,
You had left obvious lies on her skin.
 
Now you think,
That I’m yours “forever more”.
But you don’t know,
That my man’s right behind that door.