Why did Naruto Namikaze Minato betray him? He seemed to be a bad guy, and later he said he was Naruto's father. I don't know.

Muyeyin Village, the country of four generations of Naruto, did not betray Muyeyin Village. All along, four generations have been struggling for the development and growth of Muyeyin Village. He can be said to be a great ninja or a great father.

Namikaze Minato, who pretended to betray Uchiha Itachi, was always decent, and was the fourth generation descendant of Huo Ying. He died for the village ghost seal and sealed Kyubi no Youko. Naruto is the son of Namikaze Minato and Vortex Shinkunai, and Watergate is of course Naruto's father.

Huo Ying never said that Watergate would betray Konoha. When Kyubi no Youko escaped, in order to take care of the safety of the village, Kyubi no Youko was sealed in the newborn Naruto. Watergate himself and his wife died at the hands of Kyubi no Youko to protect Naruto.