There may come a time that you can talk to your former friend about it. And it is also possible that over time, you may just let dead dogs lie...
Yes, if anything went on... even if it is a question... and if you and your W begin the process of reconciliation... then this would be something to discuss. Even if you feel you've let it go. Because if there's anything left... any resentment... from what I understand it will just kill the M, eventually...
And yes, even now there are still moments of this whole thing feeling surreal... like a dream... and I want to pinch myself and wake up...
Sorry, you are here... and yes... this is real and not a dream...
But, it will get better. Of that, we can pretty much guarantee... The result just may not be quite the way you hope or expect, yet it doesn't mean that you won't reconcile... but it also doesn't mean you will.