Wow, that is more than enough to keep me busy for the next 23 days. But I will attempt to touch on some of it now.
This question makes me a bit nervous because ultimately I will say something that is offensive to someone, but I will focus on the basic truths as I know them. As a side note to start off I need to say that although I believe that no situation is bigger than God can handle or redeem, I do not believe that a spouse should stay in a situation where they are in physical danger. And In the case of infidelity, a spouse has every right to leave, although I believe with my whole heart that God can even redeem a situation where a spouse has been unfaithful. I just pray that I never have need to walk through that process.
I have not made it any secret that I believe that God is the key to a lasting marriage and some of what I am going to say comes out of a deep faith in Him and in His word. In 10 years I have been through some weighty trials in marriage. Although on the surface they may not compare to actual infidelity, financial despair, or abuse, they did evoke a conflict within myself and inflicted pain that was hard to bear. We cannot compare our suffering with another's because the trials we walk through are specific to who we are. I do not want to minimize anyone's suffering or imply that I have any clue about the pain. I have only known my own, and outside of that I can only try to imagine and sympathize. For one woman having a husband who struggles with pornography can reap devastation. For another dealing with a souse who is depressed can be a burden that feels too difficult to bear. Our suffering and pain is unique and individual to our situation and our own places of insecurity and woundedness, but God's redemptive power is available in the same way to all of us. His desire is for our wholeness and he uses marriage to bring out the junk in us...like fire brings out and burns up impurities in metal. So whatever our situation or trial, we will come out the other side a different person. And as we walk through our own pain we are equipped to help others through similar struggles.
Ok, I realize that I have barely scratched the surface of the questions, but the things that I want to say will take hours, and as I share my life and attention with 3 little people and a full day ahead I must pause for now and continue this later.