Betraying your spouse isn't just a personal failure; it's a deep betrayal of shared life.
The verse starkly contrasts the Israelites' betrayal ('dealt treacherously') with the reality of their wives: 'she is your companion and your wife by covenant.' This wasn't a casual relationship; she was 'the wife of your youth,' meaning she was likely with them from the beginning, sharing their early struggles and dreams. She was their 'companion'—someone who walked alongside them, sharing joys, sorrows, and life itself.
The betrayal was particularly heinous because it was against someone so intimately connected, someone bound by a sacred covenant, and someone who had given her 'earthly all' in trust. This wasn't just about breaking rules; it was about severing a profound, God-sanctioned bond and discarding a partner who was meant to be a reflection of God's own faithfulness.