Malbim: There are two reasons I do not accept. (a) The Navi went from Yehudah to Beis Kel via Shechem. Or he thought that Yaravam was in his house in Shechem, and went there first (and Hashem commanded him not to return the same way he came - verse 9). (b) I cannot eat with you even here (Hashem commanded me not to eat - verse 9).