I have worked with both abusers & those who have been abused.
Abusers do not change until they are held accountable. Even then they fake their changes but soon go back to abusing again. They are controlling & isolate the abused, so they cannot get the help they need. A few do get humbled & truly change but not many are willing to repent, admit their behavior & seek help to change it.
Steve Arterburn is one of those who repented & changed his life & now helps others to deal with what he calls 'toxic faith.' Here is a video where he talks about the characteristics of toxic faith. Hopefully this can help you.
How to Know if You're in a Toxic Faith System (Part 1)
He has a counseling service called newlife.com You can investigate it online.
Those abused have a naive attitude that things will change because 'sometimes' the abuser says nice things.
Those abused often do clumsy things BECAUSE they are walking on eggshells around the abuser & so focused on not doing or saying something wrong that they end up spilling something or forgetting something. I experienced the same things growing up in an abusive environment of drugs/alcohol. When that situation changed, much of my forgetting & clumsiness disappeared.
From the things that you have already said & from my counseling experience, your husband is getting ready to leave you. He is as much saying that, turning to other women for support, making you the escape goat to justify his leaving & blaming you squarely for why he is leaving & that you no longer meet his needs as a wife. You cannot respond to him because of the abuse.
You need to record & document all that he is doing to you now & keep all that you have already documented (the emails, etc.) Use your phone to record things or some tape recorder in your pocket (one of those small ones). He is trying to make you feel that you are to blame & will use things you do to justify his leaving.
You will need these in court when it comes to that or you getting custody of the children if you have any.
My niece recently went through all this with her abusive husband & his abusive parents supporting him. They constantly told lies about her. She documented all that he was doing & recording things, leaving her phone on for others to hear what was going on, as witnesses.
All this was used in court to verify what he was doing & she was vindicated. He also was fooling around with another woman & got her pregnant during this time.
Then he wanted sole custody of the daughter he & my niece had together. With all the evidence my niece & her parents had, the courts agreed with her & he didn't get custody. He was held accountable yet his behavior didn't change, as he did the same to this second girl, sad to say.
This is a typical pattern. You are experiencing it. My niece even had a private investigator follow him & verify what he was doing vs the lies he was saying. That is the level it took to hold him accountable.
There is counseling available on this forum, if & when you decide to get help. Others have provided other resources as well. We will be praying for you while you endure this difficult situation. I have seen a few marriages restored, when accountability was VERIFIED & persons could not deny the abuse anymore.
If he physically abuses you & leaves marks, then take pictures like you did in the past as evidence & if necessary, call the police, stating in these words, "I feared for my physical well being, I feared for my life.'
In my state, if the police are called in a domestic situation, one of them will be arrested. My niece had to do this & thus she had actual documentation of what was going on.
I hope these things are helpful. Here also is a wonderful list of Scriptures affirming how God sees us as His children, who we are in Christ FROM GOD'S PERSPECTIVE IN THE SCRIPTURES. Neil Anderson put this together & has some helpful books as well.
https://vintagelawrence.com/wp-content/uploads/2013/01/ANDERSON_WhoIAmInChrist.pdf
https://www.amazon.com/Who-Am-Christ-Neil-Anderson/dp/0764213806