So you extended your promiscuity to Chaldea, the land of merchants—but even with this you were not satisfied!
Here the Prophet teaches that the Jews were immoderate in their desires, just as if a woman was not satisfied with two or three followers, should wantonly crave after many lovers: such, says the Prophet, was the Jews’ licentiousness. As to his saying, over the land of Canaan in Chaldaea, some think it means, that they heaped up the impure rites of all the nations...
In these verses we have an account of the great wickedness of the people of Israel, especially in worshipping idols, notwithstanding the great favours that God had conferred upon them, by which, one would think, they should have been for ever engaged to him.
Commenting on Ezekiel 16:15-34
How weak is thine heart, saith the Lord God,.... Through sin; and being destitute of the grace of God, and so unable to resist any temptation, or oppose any corruption or lust, but carried away with everyone that offers; indulging every lust, and yet not satisfied; weak as water, unstable, fickle, and inconstant, seeking after new gods, and new kinds of worship.