I know for me the "asking me to stay," for a long time came across as manipulative. I could or would not see the reasons behind it as anything other than it was "supposed," to do. She wanted to "pretend," it never happened. Wanted to me to believe that "now," she is faithful, truthful and loving.
I had a really hard time believing this as genuine. I did not trust and anything said was immediately placed into a highly cautious space. After being lied to, it is hard to take words at face value. Genuine actions that help him find his own strength and don't expect anything in return are most valuable.
The thing about staying is that it is a choice that is made almost everyday. It can change. It is not a one time event. It is an evaluation of many things outside of your M that factor into it. I am not diminishing your role, but you are only part of his role.
The things that helped me the most was when my W did things because she wanted to and nothing was asked of me in return (even a few days later). I had to see why I would want to stay, before I felt comfortable making any commitments. I needed to see something better than I had Pre-A and I needed to see that my W would do the work to ensure I was happy and safe.
I am linking two of your posts here so forgive me that and bear with me.
If my W told me she loved me, baked me cookies and then initiated a discussion to "stay." Not stay for one day, but essentially give her an assurance that "this will work out." I would probably rebuff all three things and become angry that her behavior again was "trying to put one past me."
Considering our history, I would reflect and see a series of events to manipulate me into a certain behavior. I would get upset and probably isolate myself further. I would also push my W away to ensure there was a "safe" distance between us where I could make my own decisions in a vacuum.
I am not saying your motivations are untrue, I am just pointing out how this can look to a BH who has recent examples fresh in our minds. Fresh being years 1-2.
Instead of "asking" him to stay try telling him you are very glad he decided to stay that day. It works best at the end of the day with an I love (insert something you admire about him). I am so sorry for hurting you. You are not likely to get anything in return for awhile, but that is normal. Consistent and genuine always. Don't force anything.
"I love you so much. I am very happy you are here with me right now." Spur of the moment kind of things can be very effective.
As much as this feels wrong to you, it is his decision to stay. Don't make the decision for him. Let him regain some of his power back.
I am not trying to heap more on you as I can see that you are hurting. I am trying to help you gain a window into what is behind what you have seen lately.
A phase that most BHs go through is a severe self loathing phase. We hate ourselves for staying and that conflict plays out in horrible ways. It is mostly internal, but leaks out as anger. The truth is we are angry with ourselves for not having the "balls," to walk away. That is what we have been taught too in these cases. It destroys our sense of self and any self esteem we have. We feel like less than a man. It is a horrible, soul-crushing feeling.
Building your husband up with positive comments, even to others (when he thinks you don't know he is there is a good one) can help start his individual process. At some point he has to do this on his own. He might just need to be elevated a little to see that it is possible to feel better.
Anger is secondary. Underneath it, is a shell of a very wounded man. He feels scared, alone and worthless.
Trying helping those things, instead of asking for anything right now. Listen to the anger with humility and offer something to address one of those things underneath. Or better yet try that once the anger is exhausted.
Just trying to give you some background based on my experience. Remember if he wanted to leave, he probably would have found a way. Take it day by day. Pressing for anything right now would add to the already crippling fear.
FWIW today I am much better and I am glad I stayed with my W. She moved mountains to give me a reason and showed me that life with her would be better than a life without her. It takes time and some "heavy lifting", but it can be done. Take care.