I will espouse thee, etc... This relates to the happy espousals of Christ with his church: which shall never be dissolved.
2:20. And I will espouse thee to me in faith: and thou shalt know that I am the Lord.
2:21. And it shall come to pass in that day: I will hear, saith the Lord, I will hear the heavens, and they shall hear the earth.
Hear the heavens, etc... All shall conspire in favour of the church, which in the following verse is called Jezrahel, that is, the seed of God.
2:22. And the earth shall hear the corn, and the wine, and the oil, and these shall hear Jezrahel.
2:23. And I will sow her unto me in the earth, and I will have mercy on her that was without mercy.
2:24. And I will say to that which is not my people: Thou art my people: and they shall say: Thou art my God.
That which was not my people, etc... This relates to the conversion of the Gentiles.
Osee Chapter 3
The prophet is commanded again to love an adulteress; to signify God's love to the synagogue. The wretched state of the Jews for a long time, till at last they shall be converted.