What are the elements of a breach of fiduciary duty action?

" 'The elements of a cause of action for breach of fiduciary duty are the existence of a fiduciary relationship, its breach, and damage proximately caused by that breach. [Citation.] Whether a fiduciary duty exists is generally a question of law. [Citation.] Whether the defendant breached that duty towards the plaintiff is a question of fact.' " (Marzec v. California Public Employees Retirement System (2015) 236 Cal.App.4th 889, 915, italics omitted.)