No. You’re confusing the fundamental nature of reality with the peculiar details of our human-created numbering system. One-third is only represented by repeating decimals because we’re using base-10 numbers. There’s no good way to represent a third with base-10. However, if you use a better base numbering system like base-12, a third can be represented quite easily indeed (although, suddenly, it’s quite hard to represent one-fifth.)
The real lesson to learn is that it’s hard to represent all numbers using any system that humans have been able to create.
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