dog in the manger

from WordNet (r) 3.0 (2006)

dog in the manger
    n 1: someone who prevents you from enjoying something that they
         themselves have no need for

from Moby Thesaurus II by Grady Ward, 1.0

24 Moby Thesaurus words for "dog in the manger":
      careerist, egotist, fortune hunter, grouch, hog, individualist,
      killjoy, lone wolf, loner, malcontent, monopolist, narcissist,
      road hog, self-advancer, self-pleaser, self-seeker, self-server,
      sourpuss, spoilsport, temporizer, timepleaser, timeserver,
      tufthunter, wet blanket