This is a great discussion!
I also struggled greatly with emotional detachment. I did a few things to assist in helping move forward in a seemingly impossible task of letting go of a man I still loved deeply but who was demonstrating no love towards me.
1. Compiling a list of "facts" about my relationship and marriage with H which were unhealthy. I approached it as emotionally removed as possible....as if I was just putting together data. (for example, H choked me, H lied frequently, H often criticized my career, I didn't trust H for a significant period of time) To my surprise, my "perfect and comfortable" marriage had 42 points which were not all that good.
2. Making another list entitled "signs of healing". This was for me....ALL the things, big and small, that I found myself growing in and taking pleasure from. (for example, getting fabric softener for my clothes all the way to being able to spend an evening with friends where I DIDN'T talk about my sitch)) None of these things involved H. This reminded me of the positives that can come out of chaos....just like the flower that grows from the crack in the cement.
3. Participating in a closing ceremony in which I buried treasured items to be cleansed by the earth and water. These items were a bracelet H gave me in the first years of our R, a CD with our wedding songs and the piece of tartan he wore in his pocket on our wedding day. Symbolic ritual is something embraced by many cultures and religions around the world. Find one that may work for you and do it. Let go.
4. Using the 3 hours, 3 days, 3 months to address things such as responding to H via text or phone calls, time lining when I'm "supposed to be stronger", etc.
5. Actively doing things that I NEEDED to be doing to survive. Going to IC, going to work, finding a place to live, moving, etc. If I felt stuck (which was frequently) I paid attention and made sure I did things to get un-stuck. Posted here, asked for help from my friends and colleagues, wrote, practiced self-care, stopped wallowing and focused on my S.
6. Most difficult - whenever I found myself playing the role of the understanding, tolerant and healing wife....I STOPPED MYSELF! I literally would catch myself mid-sentence and then say to H "Ya know, it doesn't matter because that's your business and not mine. Good luck with that." I also told H to stop using me to be that understanding and consoling person in his life.....when he walked away, he also lost that gift I gave to him over all these years.
All these points were things that I have done along the way. All were difficult. I wasn't perfect and did the opposite things sometimes. It took work. I'm still practicing them and still screw up from time to time. All I can reiterate is that detaching was the HARDEST THING FOR ME TO DO and that is exactly where I am now.
You'll get there....just always make sure you're more important than the one who left.
Be well...