"The Lord said to me, 'Go, show your love to your wife again, though she is loved by another and is an adulteress. Love her as the Lord loves the Israelites, though they turn to other gods and love the sacred raisin cakes.'" NIV translation
Even after his wife has abandoned him and the kids, God sends him to get her and show her love. God is using Hosea as an example for His people and a demonstration of His love and faithfulness. God's people had turned to other things and so committed spiritual adultery and yet He still loved them. We have to admit that all of us, before we came to Christ were adulterers in this way. Even so, there are many in the "church" today who continue to live in this form of adultery as they show up to worship one day a week but the rest of the time is spent in pursuit of other gods such as money, fame, and even family. The good news is that God still loves us and wants us to truly fall in love with Him.