For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. Ephesians 6:12
A believer needs to realize that the conflict you may be having with your spouse or children is not a fight between two people, but rather you are both fighting a spirit of destruction rooted in Satan. The best way to overcome this battle is for the one “closer” to Christ to show unconditional love to the weaker one i.e. the weaker one is defined not in the flesh but rather one who has not totally surrendered their self to Christ Jesus and allowed Him to flow through the Holy Spirit, into and becoming one in their Spirit, renewing their mind to that truth, so it is ultimately acted out in the flesh, to empower them to give His unconditional love to their spouse and others. The courage it takes to let oneself go is extraordinary, but necessary, in order to (IOT) show the unconditional love that God shows us. This is what heals the broken hearted caused by the accumulation of baggage over a lifetime. Let no man separate what God has joined together. This means if God has lead you to marry your spouse, do not allow any man or woman to divide you. Now, on the other hand, if the unbelieving spouse leaves, allow them to leave so that you may live in peace and be more useful to the KOG (Kingdom Of God). It may be that when the unbelieving spouse separates, he or she will be humbled to the degree necessary for them to repent and “come to Jesus”; and that my precious brother in Christ (briC) or sister in Christ, is better for all involved. Rest in the finished work of Jesus and allow Him to move in your marriage!
I heard a good quote the other day: “everyone has baggage; find someone who loves you enough to help you unpack”; that “someone” is Christ Jesus alone; He is the Leader to heal our relationships!
But if the husband or wife who isn’t a believer insists on leaving, let them go. In such cases the Christian husband or wife is no longer bound to the other, for God has called you to live in peace. 1 Corinthians 7:15 (NLT)
“What therefore God has joined together, let no man separate.” Mark 10:9 (NASB)
“Marriage should be honored by all, and husbands and wives must be faithful to each other.” Hebrews 13:4
By God’s New Covenant Mercy, (Him not giving us what we deserve) we can always repent back toward a pathway of purity. “O Loving and Kind God, have mercy… take away the awful stain of transgressions… cleanse me from this guilt … for i admit my shameful deed; it haunts me day and night. It is against you that i have sinned…” Psalm 51:1-4
The Lord is not slow in keeping his promise, as some understand slowness. Instead he is patient with you, not wanting anyone to perish, but everyone to come to repentance. 2 Peter 3:9
See Ezekiel Chapt 16: 1-63 to put your own marriage difficulties into a relatable perspective on what our Father in heaven went through but yet still maintains a covenant.