Ask him directly: "Do you want me to LOSE this job to YOU?"
If the answer is "yes," then dump him; he is annoying, arrogant, controlling, and a complete loser.
If the answer is "no," then tell him he should not try to have an interview. Explain it to him: "There is one job opening. You and I cannot both get that opening. If YOU interview, that means you are competing with ME for this job. If you care at ALL about me, you won't do that." If he is so slow that he can't process this straight talk... Dump him.