dog in the manger

n., pl., dogs in the manger.
One who prevents others from enjoying what one has no use for oneself.

[From a fable in which a dog prevented an ox from eating hay he did not want himself.]

One who prevents others from enjoying something despite having no use for it. For example, Why be a dog in the manger? If you aren't going to use those tickets, let someone else have them. This expression alludes to Aesop's fable about a snarling dog that prevents horses from eating fodder that is unpalatable to the dog itself. [Mid-1500s]

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The noun has one meaning:

Meaning #1: someone who prevents you from enjoying something that they themselves have no need for

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