Need Help handling affair thats still going on

[kjensen]

So, H had dinner with us than left on the icy roads for his apartment. Apologized for eating and running(but at least helped with the dishes!) He called to let me know he made it OK and then I said goodbye (matter-of-factly)before he could-he seemed slightly surprised but hung up. I worry that if I start distancing myself too much, it will send him further into the arms of the OW. He and I are best friends and he doesn't really have any other friends he talks to regularly (except maybe the OW-he says he doesn't talk much about us..), so has this happened to anyone else? Where you distance yourself and they get closer to the OW? Because right now, I'm wondering if he is having second(second) thoughts about the OW since I found out about their rekindling the affair last Saturday. Should I ask him if he's going to tell his therapist tomorrow or just stay mum and upbeat? Any advice?