The fiduciary relationship of partners is discussed in 59A Am. Jur. 2d Partnership § 420 (1987):
The courts universally recognize the fiduciary relationship of partners and impose on them obligations of the utmost good faith and integrity in their dealings with one another in partnership affairs. It is a fundamental characteristic of partnership that the partners’ relationship is one of trust and confidence when dealing with each other in partnership matters.
Partners are held to a standard stricter than the morals of the marketplace, and their fiduciary duties should be broadly construed, connoting not mere honesty but the punctilio of honor most sensitive. In all matters connected with the partnership every partner is bound to act in a manner not to obtain any advantage over his copartner in the partnership affairs by the slightest misrepresentation, concealment, threat, or adverse pressure of any kind. A partner cannot act too quickly to protect his own financial position at the expense of his partners, even in the absence of malice