Grace in Brokenness: Hearing God's Heart in divorce

Divorce is one of the most difficult and divisive subjects for believers. Marriage was designed by God to reflect the oneness we have with Him. So what is Father's heart on this subject? We know that He is a God of oneness and reconciliation. We want to exhaust all possible means toward restoring oneness and reconciliation in marriage. But having said that, does God always insist that His children stay in an abusive, neglectful, or irreconcilably broken marriage at all costs? Does reconciliation necessarily mean that the marriage survives? Does He expect even the innocent victim in a divorce to remain alone forever? Is there such a thing as a graceful divorce?