Somewhat related to Why does Jack let Walt go?; why does Jack want to kill Walt in the last episode of Breaking Bad? Walt shows up under the pretense of wanting to make a deal to teach Todd a new method of making meth. Assuming that Jack has no idea about Walt's true intentions to get revenge and kill them all, why does he immediately order his men to kill Walt?
When Walt and Jack last saw each other, Jack let Walt keep some of his money and let him go. All the reasons that he let him go should still apply. He and Walt were not enemies. So why does he want to kill Walt as soon as he hears that Walt asked to make a deal with them?
He provides reasons for why he turned down the deal, but turning down the deal shouldn't make them mortal enemies.