He tears me apart

How can he hurt me like he never said he would
How can he say I love you when I know its not the truth
He hears my cry and still dont know why!
He doesnt think its about him
oh baby think again
But once again
Your the one who has me sobbing at night
Youre the one I think about when I put the razor on my skin
Even thought I said ill never cut again
And I cant
I promised I wouldntt
So I wouldnt hurt you , baby
So how can I stay so true
When u say were through?
You lied
You cheated
And my heart, how could you just tear it apart?