The cycle of birth, life, and death in our natural bodies parallels with our spiritual existence. When we are born again, what follows? Death, death to sin and death to self. And yet unlike our new birth, which happens instantaneously, death to self is a process. A series of deaths, if you will. On our way to eternal life, we die a thousand spiritual deaths. Though our sins are forgiven, our sinful nature continues to tempt us to live for ourselves rather than dying to ourselves and being conformed to the image of Christ, in whom we were created and have been redeemed.
These thousand deaths to self are usually little deaths. They are uncomfortable but bearable. Sometimes, though, after following Jesus for a long time, we slip into complacency, and we quench the Spirit rather than put to death certain persistent sins. And then it happens. The Dark Night of the Soul. When God, in his love and mercy, disciplines us so severely that we may even wish we were dead. He shows us the destructiveness of our sin and how it is killing His spirit in us. We have to die an excruciating death to self or else be enslaved by it and lose our lives.
Sometimes it is not our own sin. When we are married, we are one with our spouse, and when God is dealing with their sin, it feels like we are dying as well. It could literally be a dark night, the darkest we've ever experienced, brought on by the worst fight we've ever had with our spouse, in which the sin was being killed, but it went out kicking and screaming. The battle was not with flesh and blood, but in the spiritual realm. It felt like the end of everything had come and there was no hope, but actually it was just the opposite - it was a new beginning.
You rose from the ashes, scarred and weary, humbly clinging to the One you felt - for that dark night - had abandoned you. You were badly shaken, fearful, and desperate. Then you became empty and numb. The damage seemed irreparable, your house utterly ruined, your garden desolate...but something caught your eye - a tiny, green shoot that sprung up overnight. You had a glimmer of hope. That God had extinguished the old life, so that you could start a new and better life together. It would take lots of time and more struggle to heal from the fatal wounds, but this body, this one flesh made of husband and wife bound together in Christ, would eventually be stronger than the previous union, and the new house God was building would far surpass the old.
Your Dark Night of the Soul would give way to a bright and glorious morning. But you would need to be patient. And keep dying. Dying to self. Weeding out sin. Basking in the light of the Father. Drinking in the water of life of the Holy Spirit. Abiding in the vine that is the Son. Growing (with all the pain that entails) in the body of Christ, beginning with your own family.
The Dark Night of the Soul had another purpose, too. It brought you back to your first love. It woke you up to the truth that God is the only one who will not let you down. You may have felt abandoned, but He was with you. He wants you to depend on Him alone. To put all your hope in Him, not another human being. Only His love is perfect and His love is all you need. This is also why you must forgive.
We are unworthy, selfish recipients of His grace. He gives it unconditionally and so we must freely extend His grace. Receiving and giving grace is the most direct path to healing. This is assuming repentance and change are underway (be it ourselves or our spouse or both). That the death really happened on the Dark Night of the Soul and the new life together began - whether it be a literal night in which it all culminated or a more gradual coming into the light over time. If morning has broken, then the work of rebuilding trust must begin right now.
It may feel like there is a void where the sin used to be. You have to discover who you are as a couple without that thing. So it's not just the person "with the problem" (really, just that particular problem) who will feel loss and pain. It was enmeshed in your marriage and now there's a hole where it used to be. It feels kind of drafty and weird. We may thirst and hunger like we never have before. It won't always be this way - over time, love will fill it - but for now it is a way of keeping the death real (when we are tempted to forget or minimize it) and a vivid reminder to turn to Jesus to fill us. His love poured into each of us will trickle into the hole, eventually transforming it into a well, deepening our marriage as our souls are rejuvenated. Where sin once poisoned us, life giving water will flow.