It is so exhausting. I made the mistake of letting the real me peek out during a "why are you leaving?" conversation and holy hell it led to a kerfuffle:

"Why are you leaving?" "<3 other reasons> And, I'm a bit bored, the product and roadmap aren't very technically challenging to me".

Queue worried texts and emails from all over the company, thinking my boss isn't explaining the roadmap or hiding things, trying to figure out how to get me to stay, etc. It was a cool company that definitely helped people, but at the end of the day, it's basically a survey app and we were going to integrate with other companies that were doing the challenging technical bits. Lesson learned.