My H also said no OW but signs indicate otherwise. Don't assume you know everything. Look at the number of people on this board who started off believing the same thing, only to discover later that someone else (or just the idea of someone else) was involved. Not trying to burst anyone's bubble, just trying to be realistic.
In my case, all of our issues are very "fixable" according to MC. But those are just the issues he's admitting to. Bottom line: we can't know the whole story, so we just have to move forward with our own changes for our own sakes and hope for the best.
M: 43 H: 39 D: 14 Married 15 Together 16 BD: 6/2014 S: 8/2014 OW revealed 10/2014 Instigated dissolution 12/2014, in progress So over it!