The point is whether I give the confider the right to confidence.
Who is to decide what is a reasonable amount—the confidant or the confider?
mid-15c., "to trust or have faith," from Latin confidere "to trust in, rely firmly upon, believe" (see confidence). Meaning "to share a secret with" is from 1735; phrase confide in (someone) is from 1888. Related: Confided; confiding.