Miserable, unhappy staff person on team
One of my colleagues has become very very unhappy and miserable at work. Mostly it is because of being passed over for promotion, but maybe there are other problems that he is not telling about or something. This miserable feeling is now like he is missing deadlines and is a bit rude than before also. I think there was one 1-1 meeting with our manager also but nothing seems to help. What to do?