God instructed Hosea to marry an unfaithful wife as sign of both Israel's unfaithfulness and God's enduring love. When we gaze on a crucifix we can see both our sin in crucifying our saviour and God's love in enduring that for our salvation. Let us embrace that duality.
Based on Hosea 2:16,17-18,21-22:
On that day, says the Lord, you will call me, ‘My husband’, and no longer will you call me, ‘My Baal’. For I will remove the names of the Baals from her mouth, and they shall be mentioned by name no more. I will make for you a covenant on that day with the wild animals, the birds of the air, and the creeping things of the ground; and I will abolish the bow, the sword, and war from the land; and I will make you lie down in safety. And I will take you for my wife for ever; I will take you for my wife in righteousness and in justice, in steadfast love, and in mercy. I will take you for my wife in faithfulness; and you shall know the Lord.
On that day I will answer, says the Lord,
I will answer the heavens
and they shall answer the earth;
and the earth shall answer the grain, the wine, and the oil,
and they shall answer Jezreel;
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)