why does it hurt so bad

i know it is not worth mentioning.
but to be betrayed again by a good friend?
it is hurtful.
it made me realised that some friends need u only when they need help.
as long as ure there to provide solutions, they wud stick with u.
when everything's ok and back to normal again, they juz dumped u.
ive been there quite a few times n yet i never learned from it.
why?
i dont think im d softie type.
could it be because i still have hope n faith in everlasting friendship?
when it happened, all u cud think of was why d sudden change?
it hit u hard and it hurts.
despite of all that, thank god i still have a friend who can be tougher than me sometimes.
and yeah, after sleeping on it, i felt better.