1 Corinthians 7:15 addresses the person whose spouse has departed — specifically the one who did not choose the dissolution. The phrase "not under bondage in such cases" is the language of release from obligation, not of failure. God has called you to peace, Paul says — and peace is the operative goal, not indefinite obligation to a broken covenant.
Romans 8:1 was written for people with real histories, not hypothetical cases. "There is therefore now no condemnation" is a present-tense claim. Not "there was no condemnation once you processed everything correctly" — but now, in this moment, for the person in Christ. The guilt that attaches to moving on after divorce is often not from God. Isaiah 43:19 speaks of God making a way in the wilderness — and wilderness is exactly what the aftermath of a marriage ending looks like.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.