AI Translated Image

According to the official setting, before Doraemon arrived, Nobita was destined to marry Jaiko, not Shizuka. However, even in the timeline before Doraemon showed up, Shizuka's original husband wasn't Dekisugi.

Doraemon himself never actually told Nobita, 'If you marry Jaiko, Shizuka is destined to marry Dekisugi.'

(This applies to both the manga and the anime versions.)

Nobita had a few delusions like 'If I don't marry Shizuka, she might end up marrying Dekisugi,' and that's why so many viewers started misremembering the facts.