To sulk

To be sullenly aloof or withdrawn, as in silent resentment or protest.- ruminer, broyer du noir
be silent, morose, and bad-tempered out of annoyance or disappointment. - bouder

• he was sulking over the break-up of his band
• He's like a spoilt child, sulking in the corner
• He's in a sulk because he lost the game; he's got the sulks

A sulker is a person who sulks

synonyms: mope, brood, pout, be sullen, have a long face, be in a bad mood, be put out, be out of sorts, be out of humour, be grumpy, be despondent, be moody, be resentful, pine, harbour a grudge, eat one's heart out, moon about/around