In another thread, I recommended the book, The All or Nothing Marriage, by Eli Finkel. I'd like to recommend it to you, as well. It really does lay out clearly the ways our expectations of marriage has changed over the centuries, and the concurrent stress and joy of mutually attempting the highest level of marriage, where both partners lean on each other and use the marriage as a source of inspiration for their individual self-awareness and aspirations. It's pretty intense, but it also gives a LOT of resources and information on how to map out a path to this idealized partnership. If you both believe you can get back to that 100% level, you may find this book to be of some use to you.
I honestly wish you both the best as you traverse this challenging time in your marriage. However it ends up, I hope you both find peace and happiness.