Sforno on Deuteronomy 31:18/ספורנו על דברים ל״א:י״ח

1ואנכי הסתר אסתיר פני מהם, not as they thought that I was no longer in their midst; wherever they are My presence is with them, as our sages said in Megillah 29 “wherever the Jewish people have been exiled G’d’s presence accompanies them. However, it does not manifest itself by saving them from their oppressor.”

2על כל הרעה אשר עשה, Israel had done harm to itself, not G’d.

3כי פנה אל אלוהים אחרים, while being beset by all of their problems, instead of turning to Me in prayer, supplication and remorse, they chose to pray to idols instead.