How did Doraemon leave Nobita?

The following is Baidu robot cat, the answer of the official knowledge group time patrol, I hope to help you.

In the short stories and novels of Doraemon painted by Fujiko, there is no explanation of how Doraemon left Nobita, so we don't know. The only thing that is certain is that Doraemon probably left in Daxiong high school, because Daxiong took the time machine to find his childhood, and there was no Doraemon around him.

In addition, regarding Goodbye Doraemon, Doraemon left Nobita at that time, but because Nobita came back after drinking 808 doses of lies, the story continued and did not constitute leaving.