I agree that the "truth" can help with the MindMovies but as lostOne mentioned it can also confirm your worst suspicions or turn out to be worse than your worst suspicions.
For me, WW refused to provide any details of her "activities" with these other men (5 OMs total during our 10yr marriage).
Eventually I didn't need her to divulge the details because I discovered her secret Photovault on her iPhone and bought a computer app which allowed me to retrieve hidden as well as deleted information off her iPhone. The pictures and video clips I found really put some perspective on her "activities".
The unfortunate drawback to this was that I found a couple of pictures that I have not been able to get out of my mind. These were pictures of the last LTA OMs hand with a brand new ring on it.....which I can only assume was something that she purchased for him as a "promise" ring (or worse.....that the two of them somehow got secretly engaged or married) .......even though WW insists that she had no emotional ties to OM and that her affair was purely sexual in nature.