A child demanding a particular toy because some other child had it is usually immature and the simile here portrays the fact that the only reason he wanted to marry her was out of spite like a kid
Consider the statement "The only reason he wanted to marry her was out of spite.". Is the statement "His insistence on marrying a woman who didn't want him was just like a child demanding a particular toy because some other child had it." false? Yes/no/unknown