Anthony, same caution I gave another LBH today. If you make the cut off of contact with OM a condition, she may just go deeper underground with her interactions with him. She is being brazen with her A because of the history of both of you with the BFF. So how do you know if she really cuts off contact with OM? You probably don't. It all comes back to a single question: Do YOU want a divorce? If not, then regardless of OM, keep DBing. Otherwise, then go and file for D. My guess is that deep down, whether you want to admit it or not, you are hoping beyond hope that if you can get her to HAVE to make a choice, she will choose you and the MR over OM. The danger there is that you end up separated and or D'd and you look back with regrets that you didn't handle things differently.
Sometimes the best thing to do in DBing, is to do nothing at all.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018