How could you..?

I never knew you could hurt me like that
i never knew how much of me you actually had
there are those certain things that you cant take back
that i had apparently give you all of,
you broke my heart
you ripped it in two
you told her you loved her
when i was in love with you
you kept it from me all along
i never thought it would turn out this way,
you were with her when i was gone
you just threw my heart away
how could you say you loved me
and not mean a thing
how could you kiss and hug me
when i wasn't the only girl you were seeing
how could you completely forget my love for you
and hurt me time and time again
how could you tell her you loved her too
when with me was where you should've been