With Thanksgiving coming up, thoughts are creeping in that WW will invite OM to her family and introduce him, and she will make up some BS narrative about me, and everyone will accept him, and not see him as the low life that he is. This may just be my imagination.
I have these same thoughts with my WW and her OM for the holidays coming up. Unfortunately, there is absolutely nothing you can do to control this. Just be the best man you can be. You know the truth. She knows the truth. She may be shoving the truth down right now to justify her affair (they all do), but time and perspective will always win in the end both for them to see him as the low-life he is and for whatever narrative she makes up about you.
I will say though that one thing I did on my own was that I told her mother that I wish there had been something we could have done to work/save our marriage other than her building a relationship with another man before bailing on me. I did this because her mother said that "our entire marriage was a lie" and I told her that is entirely false, we had some unhappiness right there at the end but she is slandering our marriage as all cheaters tend to do to justify their decisions. This probably does not follow any kind of DB principles, but it did seem to change her mother's perspective and tone with me and did make me feel better for her to know the truth.
