Yet she multiplied her promiscuity, remembering the days of her youth, when she had prostituted herself in the land of Egypt
The prophet Hosea, in his time, observed that the two tribes retained their integrity, in a great measure, when the ten tribes had apostatized (Hos 11:12, Ephraim indeed compasses me about with lies, but Judah yet rules with God and is faithful with the saints; and this was justly expected from them: Hos 4:15, Though thou Israel play the harlot, yet let not Judah offend); but this lasted not long.
Commenting on Ezekiel 23:11-21
Yet she multiplied her whoredoms,.... Though the Lord frowned upon the Jews in the times of Jehoiakim and Zedekiah, yet still they went on, and increased their alliances and idolatries with the Heathen nations: in calling to remembrance the days of her youth, wherein she had played the harlot in the land of Egypt; they called to mind with pleasure the idolatries of their fathers...
Israel first "called" her lusts, practised when in Egypt, "to her (fond) remembrance," and then actually returned to them. Mark the danger of suffering the memory to dwell on the pleasure felt in past sins.