How can Hashem take Yisrael back in the future after He has divorced them and sent them out amongst the nations?

(32,1) Listen, O heavens, and I will speak, and the earth shall hear the words of my mouth.

The Sifri on this parsha says that in the future Yisrael will come and say to Hashem: Master of the World, You wrote in Your Torah "If a man sends away his wife and she goes from him and marries another man, may she return to him again?" (Yirmeyohu 3,1). Therefore, since You have sent us out to be amongst the nations how can You take us back in the future? Hashem will reply to them: It says in the posuk "if a man sends", but "I am G-d and not a man" (Hoshea 11,9). House of Yisrael, are you divorced from Me? Does the posuk not say "Thus says Hashem: Where is your mother's bill of divorce with which I sent her away?" (Yeshayohu 50,1).

This Midrash is a puzzle, but we can explain it according to the gemara in Gittin 77a which says that if the place to which a man throws a bill of divorce to his wife belongs to him, then she is not divorced. This is what Hashem is saying: I am G-d and not a man, and therefore all the world is mine. Thus, there was never a divorce.