How could you!?

It hurt enough knowing what you did
now i know who you did it with
i cant believe you kept it from me
and you still dont know that i know
i found out from your sister
it cut me deep inside
i want so much to scream at you
but i cant tell you i know
i only found out yesterday
3 years along the track
i hate you so much right now
i dont want to look at you ever again
but i have to pretend everything is ok
i want you to know that your the reason
for the scars upon my skin
you've done nothing but make me hurt more and more
I HATE YOU!