Maybe a dumb question, but when he says that "nothing has changed" have you ever asked what exactly hasn't changed?
Look, if you look back at the original post here, what you gave us was checklist, a "honey do" list if you will.
NC? Check.
No social media? Check.
GPS location? Check.
What you are doing are tasks. Tasks have little to nothing to do with change. If you stop for milk, pick up the dry cleaning, and drive the kids to soccer practice, are you a different person by the end? At the end of the day, what you are doing (to quote Brene Brown, "Rising Strong") is "hustling for your worth". You are still trying to make him happy, and in so doing, looking for approval from him. Your own self-worth is still tied to his approval. Since he doesn't approve of you, you are flailing for something else to try and convince him otherwise. I know you say you aren't trying to manipulate him, and I believe that you believe that, but your actions and expectations say otherwise. You are still fighting for what YOU want. But what does HE want? What is best for him, in his eyes? How is staying with his cheating spouse something he should desire? All it seems to be doing is killing him slowly, and killing you slowly by proxy.
He does not want to approve of you right now end. Period, end of story. The things you are doing right now, are things you should be doing anyway... things you should have been doing in the first place. The fact that you are doing them now, after betrayal, may actually feel insulting to him. Like buying candy and flowers after an argument, it can feel like a hollow attempt to patch things up when the issue itself isn't resolved.
He can't know/prove that you have actually gone NC, or that you haven't secretly checked social media on another account, or haven't turned off the GPS, etc. He's been fooled before. He'd rather not believe anything than be fooled again.
As others have said, sometimes, infidelity is a deal-breaker. That HAS TO BE a possibility in your heart and head, because if it's not, then you'll keep hustling for your worth, and he'll keep feeling like shit.
You need to be different than you were before. If he is to believe that you are safe, then he first needs to see, and really accept, that you have changed, and that kind of change is profound. It takes time. It takes patience. It takes great dedication and bravery and a willingness to fail over and over again. It takes a willingness to suffer.
If he's capable of healing on his own, then when he's done, he's going to look to see where you are at. If you are someone who doesn't NEED him to define your own worth, someone who can be sacrificial, someone who can show him genuine empathy and understanding, then that's someone he might reconsider giving a second chance. But that day is not today.
Last thing. I'm not saying to not do all these things listed. They are part of what must be done. But understand that these things are simply "damage control" while the changing takes place. They are not the goal. The goal is to change into a person who loves themselves, has safe boundaries and for whom integrity and responsibility is what their self-identity is built upon.