Why?

I don't understand
why Im feeling so sad
everytime i think of you

it hurts when you smile
i know your not mine
i don't know what I'm gonna do

you used me, you lied
you hurt me, i cried
still I'm crazy in love with you

all this time
it was all a lie
nothing but wasted time

i don't know why
i still believed you
when you said the words "i love you"