Why?

Why would someone do that ?
try n break us apart
when that person said that
i thought it was u
i thought it was true

how could i believe that
and hurt myself even more
i cried myself to sleep
for over a week

you are my best friend
and that hurt me so
so please don't ever go
when they said that
i grabbed my knife

i made 3 deep cuts
so that my blood spilled out
you could never realize
that you could
cause me more pain then a knife

anyone could
but mostly you
when you went away
it tore me apart

i cried that night
so much that my eyes were red
and it looked like i was stoned
again and again i promised
that i would be here

but then i didn't stay
because i thought it was you!

someone please tell me
why would someone do that
try n rip us apart

just please tell me why?

*thats about me n my best friend ...she moved away in the summer and one night on msn someone else was on her msn when she was in Florida n told me that she hated me n was so much better n never wanted to talk 2 me again ... it tore me apart n so i wrote this but really can someone tell me why someone would do that? because i just cant understand that*