My Parsley Leaves Are Yellow And The Roots Are Rotted.

Question

I’m not certain as to why it does that.

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Answer 1

Your parsley may have been overwatered. Roots rot when there isn't good soil drainage, forcing them to sit in wet conditions. These two articles will help:
https://www.gardeningknowhow.com/edible/herbs/parsley/why-does-parsley-turn-yellow.htm
https://www.gardeningknowhow.com/edible/herbs/parsley/parsley-plant-is-wilting.htm