1)
"His heart was not complete with Hashem like David's heart" implies that he was with Hashem, just not totally. The verse said before this that they veered his heart after idolatry!
1.
Malbim: He did not serve idolatry, Heaven forbid! Only, he did not protect against his wives serving idolatry. This revealed that his heart was not complete with Hashem like David's heart. If it were, he would have divorced them!
