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Why was Henry the Young King unhappy after being crowned as co-ruler?

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King Henry II and St. Thomas Becket — Henry II Henry II (left) disputing with Thomas Becket (center), miniature from a 14th-century manuscript; in the British Library (Cotton MS. Claudius D.ii).

Henry the Young King was unhappy after being crowned as co-ruler because, despite his title, he received no actual share of his father's power. Although he was crowned king in 1170 and again in 1172 to rule in association with Henry II, he remained effectively excluded from the administration of the realm.1