because the hokage ask him to become a teacher or is it that he quit anbu because he is tired of killing people and and that time he is killing someone precious to him-_-
^ answer above don't give citation and the truth is it's still a mystery. This is a matter that inspired more than a few fanfictions, many speculation went about, including a past love who was killed in a certain ANBU mission, also explained why Kakashi doesn't seem to be interested in women nor having a love life.
But it's still remain unanswered by Kishimoto.
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Orochimaru tried to possess Itachi as an attempt to acquire the Sharingan however it failed and he was forced to defect from the Akatsuki.
Orochimaru left Akatsuki because he went after Itachi after he arrived to akatsuki after the uchiha massacre. So he went after Itachi's sharingan and failed causing him to leave
Sort of. He gets kicked out because he fails a mission.
He wasn't replaced because he kept his ring
SPOILER ALERT Depends on what you are asking. His partner in the Akatsuki is Kisame Hoshigaki. I assume that is what you mean.
He joins Orochimaru for 3 years for training. He then kills Orochimaru, and forms the Hebi (later known as Taka), which includes Jugo, Suigetsu, Karin, and himself. Taka then does some favores for the Akatsuki (specificlly Madara), like capturing the 8 Tails. They wore Akatsuki robes when doing so, but after the favor was done, Sasuke claims the Taka isn't working for them
deidara killed himself because he blew himself up to kills sasuke but he failed