One way of splitting the people of the world is into people that would lie about business, and people that wouldn't. You don't ever want to work for a CEO that

One way of splitting the people of the world is into people that would lie about business, and people that wouldn't. You don't ever want to work for a CEO that will, because he'll lie to you too. Avoiding working with people that lie about business is a good heuristic to keeping to what you do best - working. If you think that you might have legal trouble for not telling people about this, then talk to a lawyer. Otherwise, find another job and don't look back. If you hear anyone doing business with this guy again and you care about them, warn them about what you overheard and why you left - personally, I would really appreciate such advice. Otherwise, don't mention it unless someone asks.