RWBY - Everything makes sense now

Or he was too focused on the fact that he thought Weiss was going Yandere on him because all of his friends, including Pyrrha herself, refused to tell him otherwise despite the fact that it was making the Ice Queen feel uncomfortable.

Maybe it was the fact that everyone continued to say good job instead of actually assisting him in training.

Or maybe it was the fact that Jaune throughout his childhood was probably held back from doing anything because A: his sisters picked on him, B: His mother was extremely overprotective, C: his father refused to train him because some reason.