A supporter shall do all of the following:
(1) Support the will and preference of the adult and not the supporter's opinion of the adult's best interests.
(2) Act honestly, diligently, and in good faith.
(3) Act within the scope set forth in the adult's supported decisionmaking agreement.
(4) Avoid conflicts of interest.
(5) Notify the adult in writing of the supporter's intent to resign as a supporter.