I dont know exactly where you are in your sitch but if there is a single thing I wish I would have understood better when looking back it is my own and my wife's view on sex and drives for sex. I believe it is the only ONE thing that might have changed the outcome of my R. So if you have the capacity, read as much as you can about sex and desire. Not saying it will change things, but it might help you understand more what is going on and help you validate her around what seems to be her cornerstone of all this.
Also, if you havnt read or listen to "love must be tough". Sounds like it would suit you.
Me: 34 Stbxw: 30 D:5 D:3 Mini bd: May/June 2019 Married: Aug 2019 BD: 6th Dec 2019 OM Confirmed: Feb 2020 March 2020: I filed for D Waiting for D to be finalized and W to move out end of January 2021