Sorry you've made it here, BM and sorry that it's taken me a bit to come back. I've been busy in my life right now and haven't had the chance to get on the boards as much.
First off, I agree with BeingMe, you need to detach from the situation and work on yourself. Become the man she fell in love with in the first place. Read DR/DB and talk on the boards. People here are terrific and can pass knowledge and advice on to you that's very supportive and works.
Since you posted on my thread, are you suspecting that W is going through MLC? If so, read up on all you can on women's MLC and MLC in general. I highly recommend reading up on Smurf's MLC Resources thread. It's got everything you need for an MLC toolkit. The main thing with MLC is TIME and PATIENCE.
Hopefully, she isn't MLC, since that is the toughest trial that your marriage will ever face.
For your own sitch, the LRT sounds like the best method. You have to work on yourself and work fast. Going Dark isn't always part of LRT, but it is favored by many in MLC boards to ease the pain of the spouses. Also, Going Dark isn't about giving the Spouse a taste of living on their own, it's about detaching yourself from a bad situation so you can GAL and increase your PMA.
Finally, I can say the pain does lessen as time goes on, and you will be able to function each day. It's kinda cliche, but it's definitely "One day at a time" when you're DBing.
Good luck and if you need anything, know that we're there for you!
"I made the wall of shadow draw back, beyond desire and act, I walked on.
Oh flesh, my own flesh, woman whom I loved and lost, I summon you in the moist hour, I raise my song to you."