Will the wife be divorced if the husband made her divorce conditional on not benefiting from a certain person, then he feared benefiting from him and refrained from dealing with him, and then he said to another person: "If you don't shut up, you'll be like him," then will his wife be divorced if he benefits from this latter person after saying this, or if the man says to himself, "My wife will be divorced"?

If your situation is as you described, then you are afflicted with waswasa (obsessive whispering). The certainty of the marriage remaining intact is not removed by doubt regarding divorce. The default is that you have not done what you conditioned the divorce upon, until proven otherwise. Even if you conditioned the divorce and doubted whether you did what you conditioned the divorce upon or not, the default is that you did not do it, meaning you did not break your oath. And divorce due to the dominance of waswasa does not take effect. To get rid of these obsessive thoughts, ignore them completely and treat your wife as if nothing has happened.