well in the anime they showed the akatsuki offer him to join, but he refused....so they said if he'd win against one of them, he can go, but if he lost, he must join....and he lost to Itachi, which is why he hated sasukesee every other member in akatsuki have reason to join it but i don't know why deidara did it
plz tell me
Yes he did in a way.we never got that story. Kishi never explained it.
well in the anime they showed the akatsuki offer him to join, but he refused....so they said if he'd win against one of them, he can go, but if he lost, he must join....and he lost to Itachi, which is why he hated sasuke