Jamieson, Fausset and Brown on Hosea 2:19-20

19-20. "Betroth" is thrice repeated, implying the intense love of God to His people; and perhaps, also, the three Persons of the Triune God, severally engaging to make good the betrothal. The marriage covenant will be as it were renewed from the beginning, on a different footing; not for a time only, as before, through the apostasy of the people, but "forever" through the grace of God writing the law on their hearts by the Spirit of Messiah (Jr 31:31-37).

righteousness ... judgment--in rectitude and truth.

loving-kindness, &c.--Hereby God assures Israel, who might doubt the possibility of their restoration to His favor; low, sunk, and unworthy as thou art. I will restore thee from a regard to My own "loving-kindness," not thy merits.