Why dosent it hurt

Why don't i hurt
why don't i cry
when i see you holding her
and not me

it been 2 days
yet you replace me
but i don't rely hurt
that scares me

we were together
and i was so in love
when you cheated
i hurt for so long
but, now you my best friend again
and I'm alright

i don't know what to say
its not phasing me
that rely scares me
it doesn't hurt me?