They have forsaken me, i.e. the king, and his concubines, and people, who easily followed his example, but were not at all excused by it.
Related Commentaries of 1 Kings 11:33
1 Kings 11:33
33 Because that they have forsaken me, and have worshipped Ashtoreth the goddess of the Zidonians, Chemosh the god of the Moabites, and Milcom the god of the children of Ammon, and have not walked in my ways, to do that which is right in mine eyes, and to keep my statutes and my judgments, as did David his father.