Perhaps there are some student complaints and a forthcoming investigation into his activities, and he’s attempting to get out in front of it. Maybe he diddled one little boy too many, slept with a coed, or groped a male student. That’s typically why these government funded university tit-suckers with tenure resign. It never has anything to do with principles or honor. It’s always a legal issue and he’s looking for a soft landing spot.
He could have done a lot of things, but I think you are being like a Democrat to just make up things with no evidence.