Welcome to divorcebusting.com. Divorce Remedy and Divorce Busting are designed to be used by ONE of you. Showing it to your spouse may backfire.
When he is interested in working on the marriage, KEEPING LOVE ALIVE is designed for one or both of you. So is THE MARRIAGE BREAKTHROUGH.
So what you want to do is USE THE SEVEN STEPS to bring more love into your marriage.
You say you implemented the LRT, but I'm not sure that means to YOU. What did you actually do? You have good information about what didn't work for you (telling him you want to save your marriage).
At this point: Don't snoop, don't appear to be trying to hang on to him, and don't make the demands about the other person right now.
Do right down what his complaints/dissatisfactions are, and what you think is so attractive to him about this other relationship--what do you think he is getting that he needs.
Hang in there, there is hope, and we're here to help you.