I just know this is going to get really messy now.
It might but from what I've seen you've done everything possible to prevent that. If the only way to keep things neat is by acquiescing to your W's having an OM, you moving out of your own house (btw was also thinking if you do this your W may/will likely have OM over at your house too, just something else to think about), and being an emotional support to her while she's having an A; then so be it.
I often see the guys on here advising men to be strong and confident, and I agree with that. I actually think the women need to do this too, but men as well. You have nothing to feel guilty about! Do the right thing now to protect yourself and your family. I 100% believe at some point things will go sour with OM, and then she'll be wanting to try to R with you. You can decide at that point if you would even want to...
