All the dating naysayers out there, this is why it works.
It's also not the only thing that is effective. Dating isn't a cure all. If it was would you still be where you are?
It's the mindset/attitude that you need to develop. "I'll be fine without you. I want you, I don't need you. If you don't want to be married to me then I will find someone else to share my love with." This is loving detachment.
Now you are internally validating yourself instead of needing the external validation. This is a much healthier place to begin any new relationship.
You can be a great DBer, go date, detach, GAL, 180, act as if all you want, still doesn't mean you are going to save your marriage. While it only takes one person to change the dynamic, it does take two to have a great marriage. In the end you are only half the equation. You can't control the other half.
This is the brutal reality, most of the people who post here don't save their marriages. A real DBer will save themselves regardless of the outcome. Have a open mind, try new things - if they work keep doing it, and be responsible for your own happiness.
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.