who's that girl?

there were places we would go at midnight...
there were secrets that nobody else would know..
there's a reason but i don't know why..
i thought they all belonged to me..
seems that everything's the same around me..
then i look again and everything has changed..
i'm not dreaming so i don't know why..
she's everywhere i wanna be..
who's that girl?
where's she from?
no...she can't be the one that u want..
the one that has stolen my world..
it's not real..
it's not right..
it's my day..
it's my night..
by the way..who's that girl that lives in my life?
i'm the one who made u laugh..
who made u feel and made u sad..
i'm not sorry..
for what we did..
for who we are..
i'm not sorry..
i'm not her..