Jamieson, Fausset and Brown on 1 Kings 12:15-18

15-18. the king hearkened not unto the people, for the cause was from the Lord--That was the overruling cause. Rehoboam's weakness (Ec 2:18, 19) and inexperience in public affairs has given rise to the probable conjecture, that, like many other princes in the East, he had been kept secluded in the harem till the period of his accession (Ec 4:14), his father being either afraid of his aspiring to the sovereignty, like the two sons of David, or, which is more probable, afraid of prematurely exposing his imbecility. The king's haughty and violent answer to a people already filled with a spirit of discontent and exasperation, indicated so great an incapacity to appreciate the gravity of the crisis, so utter a want of common sense, as to create a belief that he was struck with judicial blindness. It was received with mingled scorn and derision. The revolt was accomplished, and yet so quietly, that Rehoboam remained in Shechem, fancying himself the sovereign of a united kingdom, until his chief tax gatherer, who had been most imprudently sent to treat with the people, had been stoned to death. This opened his eyes, and he fled for security to Jerusalem.

1Ki 12:20-33. Jeroboam Made King over Them.