How could I be so stupid

How could I be so stupid as to believe that you had changed,
I should have known that all the anger would once more be engaged.

How could I be so stupid as to think you might have cared,
you left me in no doubt you don't,
when you left me running scared.

How could I be so stupid as to let you in again,
sure don't I always learn the hard way, you always have to win.

How could I forget it's me that has to pay,
Your the one that makes it happen,
that makes me feel this way.

How could I be so stupid as to get taken in,
it was only so you could crush me,
tear my heart out from within.

Why does it hurt so much?
I should be used to it by now!
All is left is for me to wonder How?

How could I be so stupid?