I have the exact same struggle. DB Coach suggests being a friend while lovingly detaching. At times it feels like it's working, and then there is a rebound of her pulling farther away. I also am starting to feel like she's abusing me for money while stringing me along, because, why not - she can. I don't want a best friend. I want a wife who is my best friend.
There is no loss for my W at the moment, and it doesn't seem like there will be real progress until there is. It is hard to find that balance. I wish you luck in finding the balance that works.
Me: early 30s Her: same M: 5+yrs T:10+yrs D (2): under 10s OM PA - Began Apr/15 A Discovered/ILYBINILWY: Start of May Removed ring: End of June