>I figured at the end of the day I was fired. My boss laughed at me and told me good job for owning my mistake, fixing it, and then making sure it could not happen again.

i forget the origin of the story, but i loosely remember a story about a boss and employee in a similar situation. the important bit was the bosses line ($ adjusted to match your story):

"why would i fire you when i just spent $250k training you"

You may be thinking of Dale Carnegie's classic story:

> Any fool can criticize, condemn, and complain—and most fools do.

> But it takes character and self-control to understand and forgive.

> “A great man shows his greatness,” said Carlyle, “by the way he treats little men.”

> Bob Hoover, a famous test pilot and frequent performer at air shows, was returning to his home in Los Angeles from a show in San Diego. As described in the magazine Flight Operations, at three hundred feet in the air, both engines suddenly stopped. By deft maneuvering he managed to land the plane. It was badly damaged, but fortunately neither he nor his two passengers were hurt.

> Hoover’s first act after the emergency landing was to inspect the airplane’s fuel. Just as he suspected, the World War II propeller plane he had been flying had been loaded with jet fuel rather than gasoline.

> Upon returning to the airport, Hoover asked to see the mechanic who had serviced his airplane. The young man was sick with the agony of his mistake. Tears streamed down his face as Hoover approached. He had just caused the loss of a very expensive plane and could have caused the loss of three lives, as well.

> You can imagine Hoover’s anger. One could anticipate the tongue-lashing that this proud and precise pilot was about to unleash for that carelessness. But Hoover didn’t scold the mechanic; he didn’t even criticize him. Instead, he put his big arm around the man’s shoulder and said, “To show you I’m sure that you’ll never do this again, I want you to service my F51 tomorrow.”