How should a Christian react when they find out their partner has been cheating?

Discovering a partner's infidelity is a devastating betrayal, and a Christian's initial reaction should be to lean on God for emotional strength and guidance (Psalm 34:18), not immediate retaliation. The biblical response requires a process that involves lament, decisive action (Matthew 18:15-17), and a reliance on the Gospel's power to either forgive or justly separate. While the option for divorce is biblically permitted in cases of sexual immorality (Matthew 19:9), the primary call is to seek holiness, truth, and genuine repentance for the preservation of the soul and the family.