dog in the manger(n = noun.person) - someone who prevents you from enjoying something that they themselves have no need for;
is a kind of selfish person

N  selfishness, self-love, self-indulgence, self-worship, self-interest, egotism, egoism, amour propre, nepotism, worldliness, world wisdom, illiberality, meanness, time-pleaser, time-server, tuft- hunter, fortune-hunter, jobber, worldling, egotist, egoist, monopolist, nepotist, dog in the manger, charity that begins at home, canis in praesepi, foes to nobleness, temporizer, trimmer, selfish, self-seeking, self-indulgent, self-interested, self- centered, wrapped up in self, wrapt up in self, centered in self, egotistic, egotistical, egoistical, illiberal, mean, ungenerous, narrow-minded, mercenary, venal, covetous, unspiritual, earthly, earthly-minded, mundane, worldly, worldly- minded, worldly-wise, timeserving, interested, alieni appetens sui profusus, ungenerously, to gain some private ends, from interested motives, apres nous le deluge.

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