I very much doubt that an insensitive man who refuses to apologise, explain or take responsibility for any offence he caused you, has " an impeccable work record and ethics " history.
Such behaviour is not new. Over years he must have upset, hurt or angered countless colleagues, employees, bosses, customers, patients, neighbours, etc.
So, is he just a charming and charismatic self-promoting liar who spotted your vulnerability and is homing in on it for his own advantage?
You sense something is not quite right. Trust yourself. Not him.