Who is someone you’ll never see the same way again, and what changed?

In other words, let's say you know someone and, at one time, you viewed them as an overall good person. However, they did something that completely changed your opinion of them. For me, it's a manager at work. In short, she did something completely conniving towards me and I'll never look at her the same way.

Who is someone you’ll never see the same way again, and what changed?
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