I'm looking for a one (two might be ok) word description for a person who doesn't want anyone else to have a better life than himself. This is the type of person who will break your crayon on purpose because he accidentally broke his own. He's not inherently mean; if his own life is going well, then yours can, too.
To make this a little stronger, here's another example. Describe (in one or two words) a person who, after being born with only one arm, goes around chopping off other people's arms because he thinks it isn't fair that they all get to have two.
So far, the best I have is bitter or malcontent, but neither of these is strong enough in my opinion.
For context, I'm writing a log line and having trouble getting a strong enough adjective to describe the antagonist.