I agree with those comparing it to how someone acts in a romantic breakup (this doesn't mean I think there was something romantic from either side). I'm not proud of this, but I can think of a couple past relationships (of 6 months to a year) where when I realized I wanted to end it, I got rather cold, even though I'd cared about the guy very much during the relationship. I'm generally a very caring, compassionate person, so it's like I had to temporarily turn that off to detach from those relationships. I guess I've done that leaving a job or two as well (though my first real job that I resigned I cried through my resignation). But that also doesn't mean I never cared about my coworkers or boss (and wouldn't hold some caring and thoughts about them in the future), just that it was time for me to move on.