Business is built in lies, or (if you don't like the word Lie) on not telling the actual 100% truth. Lots of people every day are out every day looking for a new job and they don't tell their coworkers, or their boss. I did that myself during my 40+ years of professional employment.
Why was I looking for another job? Almost always (85% of the time) for more money. In business, it is the most certain way to get a meaningful increase in salary over cost of living raises, which never cost of living increase, by the way. A couple of times (15%) it was for a better (more shiny/Sparkly) company, where I thought it would be fun to work and where my ego would be fed.
I am certain Dan left poorly. I have yet to hear that he thanked MSU for the incredible stepping stone we provided for him to elevate his financial worth to the big time ranks. All this shows is that he is a man with no class at least IMO.