"Remarriage is permitted for the faithful partner only when a divorce is based on biblical grounds. (Romans 7:1-3; 1 Cor. 7:39). Those who divorce on any other grounds have sinned against God and their spouse and for them to marry another is an act of "adultery" (Mark 10:11-12) This is why Paul says a believing woman who sinfully divorces should "remain unmarried or else be reconciled to her husband" (1 Cor 7:10-11). If she repents from her sin of unbiblical divorce, the true fruits of that repentance would include seeking reconciliation with her former spouse (Matthew 5:23-24) The same is true for a believing man who divorces unbiblically but later repents. (1 Cor. 7:11) Such a person could remarry someone else only if the former spouse had remarried or died, in which case reconciliation would be impossible."
- John MacArthur & The elders at Grace Community Church in "Right Thinking in a World Gone Wrong"