Why Does Jonah Want Nineveh to Be Overturned?

In 2 Kings 14, the northern kingdom took advantage of this period of Assyrian weakness and he conquered a whole bunch of territory. So Jonah is probably feeling pretty good about that because he prophesied in favor of the military exploits of the king. But then just a few years later, Amos comes along. Maybe Jonah felt betrayed by this. It's like God was flip flopping and making him look stupid, hanging him out to dry. He should be looking out for his own prophet not these clowns from some other country.