Totally understandable. Thanks for sharing! I wonder if you're at the point of Last Last Resort, i.e., ultimatum. Maybe, you need to shake things up a bit and start the D process? Show her that you're not going to wait around for her and she needs to make a choice - you or OM. She's got you on a rope. Check out pages 230-231 in DR. This might be the point you're at. Again, the paradox is that it may just save your marriage. She needs to know you won't wait around for her. She's being lazy about moving on the D b/c she sees you as a plan B. Again, I'm no vet! Read that part of DR and report back on your plan.
ETC
"Whether you worry or not has no affect on the outcome. But, moving forward, letting go, and making changes can." UrWorthy