I was recently working with a leader who had just lost a much-valued employee to a competitor. He had invested a large amount of time in mentoring and training the person and had high hopes and expectations for his career. The employee was someone clearly identified as “top talent” within the company - and what’s more, the resignation came as a complete surprise. The team leader was feeling let down and annoyed.
""Don't Take It Personally" Is Terrible Work Advice" is from hbr.org, published on March 29, 2016