Come si dice in Inglese (Stati Uniti)? Let’s say for instance, you confided to a colleague about planning to quit your job but quite unsure yet. But that colleague went straight to your boss and told it himself/herself without your consent. Is that bypassing or is there another word for it?

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​@N-e-s-t-e-a well, actually yeah. The way you said it works really well. To steal someone’s thunder would be like to take credit for something that someone else was planning on doing. Or rather to do something someone else was planning on doing and getting all the praise for it. (It usually always refers to something positive or praise-worthy)

-Sorry about stealing your thunder, I was working with her so I shared the news with her. (I actually did “steal my brother’s thunder” just the other day by sharing the news of his engagement with my sister at work… he was planning on telling her that afternoon but he had told me that morning) anyways, I suppose you could use this phrase with your example, but it’s usually used praise-worthy things. Another example:
-I was so close to winning! But of course he had to swoop in last second and steal my thunder.

With your example, I’m not sure if there’s a very good verb/phrase you could use. You could say that the news was yours to share as in you alone had the right to give the news.
-That was my news to share. Why would you go around me and tell her? (Go around = bypass)

P.S. Thank you btw! 😊