Well alone, only you can truly answer those questions. I have read many stories on here and some of the most successful ones stayed friends all the way through no matter how hard it was.
For me personnally, i found being my w friend has moved me further than being dark or distant from her. It made her remember we have been in each others lives for 20 years. That i am the only constant person in her life she can talk to.
I have had to listen to some pretty tough things, like she loves the OM, i have had to realize that my w did the one thing she swore she would never do, she left kids to be with OM. I still have had better luck being her friend.
You will have to decide if you can handle what he says about OW etc. If you can keep a smile on your face and secretly cry on the inside.
Whatever you decide, know that you can vent on here as much as you need to. We all will listen and support you.