Have you ever felt disappointed in people?

I have felt disappointed in people quite a few times but yesterday was something a lot.
Not gonna name anyone but it was disappointing to see how people can move on so quickly from a heart break or sadness. It's like a switch just turn it off and everything is back to normal.
Maybe they are right and you can move on within a day Or two but it is hard to understand for me as if I suffer from a heartache it takes a lot more time then a day Or week.
How do you all feel about it?
Have you ever felt disappointed in people?
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