I've read through this thread and have been struggling to come up with a clear way of articulating what is coming into my head, so I will bumble through this.
One of the concepts of healing from the trauma we've been through after discovering betrayal is that of "OWNING YOUR SHIT." This applies to both the wayward and the betrayed.
You've come here in anguish about your internal state after your wife has tried very hard to repair the damage she has done to you and to the marriage. She, so far as I've read, has "owned her shit" and tried to make amends. I'm referring to outward, visible actions. Perhaps she has also done the internal work to figure out where she went wrong and has tried to make corrections to her internal self too. To know how she lost control of her senses, how she came to fall down the rabbit hole, and as also worked to try to heal her shame, embarrassment, her moral compass, in order to be safer, trustworthy, honorable in fact, going forward in her life. I'm speculating because she isn't here to tell us first hand, but it is possible she is doing the hard work to heal internally.
On the other hand, you have fallen into the trap of blaming your wife for your pain. For your numbness. You argue very rationally how this is all her fault.
You are doing the work you think you need to do to repair your marriage. You are going forth doing the externally visible actions of moving on. You show her love, work to maintain a nice home environment, give her orgasms, etc.
But you are not owning your pain. You have fallen short in the internal work department. You are not claiming your pain, and holding it and saying this pain is mine, it has powerfully taken over my happiness, and I have given up all hope of conquering it while I stay with my wife. It is her fault, she hurt me, this pain I endure is eternal and it's all because of her. And because it is her fault I can't get away from the pain unless I get away from her.
Your emotional healing is your responsibility and yours only. Leaving your wife will not fix the pain problem. It will not cure your numbness. It will not make the mind movies go away, It will not change your internal state by changing your external situation. You will simply substitute other situations and environments and people, and still have the same you inside, the same hurting you.
Your inability to open up and reveal to your wife your constant mind-movies, the burning humiliation of her dirtying herself, the mechanical duty of sex that makes you want to stop as soon as you possibly can, is YOUR SHIT TO OWN. Your inability. Your paralysis. Your silence.
You have been unable to be genuine and authentic and vulnerable and HONEST about your internal state. THAT is what is hurting you. It is the lie you are acting out. You are acting as if you are OK, and the cognitive dissonance is killing you because you know you are not OK. She may have given you the pain, but you now hold it, and you are keeping it a deep dark secret. It is in your hands, cloaked. She no longer has any control over it, or even awareness of it because you are hiding it. And now you are bludgeoning yourself with it -- without recognizing that your own hands are holding the club and not hers.
I suggest that you do not need to divorce to find happiness and love again. You need to get some help to come to terms with your emotions that are keeping you trapped in unhappiness. You need to learn how to uncloak and show the club, and talk about the bruises, and the mind movies and the humiliation and sadness, and fear of losing what you've worked so hard for.
Find a psychotherapist. Enroll in treatment. Go for a year. Just you. Not a marriage counsellor, the problem isn't your marriage.
Actively work to heal your pain. Choose to try to rekindle your love. Choose to try to vanquish the mind movies. Spill your guts, take the homework. Draw on an artist's pad, start a journal, start using words that contain emotional content to describe what is happening inside you. Find where you hurt and are scared and are angry and ashamed, and get those FEELINGS out in the open where you can examine them, and sit with them, and realize they are part of you and you can be OKAY with them, and temper them, and morph them, and bring into your head and heart the feelings you WANT, like love and grace, like peace and contentment, like ease, like a giggle and a tickle and a burp and a fart, you can let go and be yourself, and you can look at your wife and her beautiful hair and the twinkle in her eye and her love for you and remember why you married her, you can recall the early parts of your life with her and truly forget for a moment the recent parts, and enjoy her and yourself -- without the torture of the club holding those mind movies between you.
If you want to fall back in love with your wife, there is a pathway to do that. It's not easy but you seem like a man who can figure out how to do something hard, and do it well.