Why Worthing decides to get rid of Ernest very soon?

Mr Worthing decides to get rid of Ernest very soon because Cecily, his ward, wants to know more about her guardian's wicked brother Ernest. Although Ernest really doesn't exit. Also, he decides that because he proposes to Gwendolen and Worthing wants to be a loyal husband for her. Finally, Mr Worthing doesn't tell the true to Gwendolen because she adores his name and if he tells the true things would change between them. Can it be an answer?