You don't have to say anything to W for a while....you just file it away and be on the look out for some hard evidence. You might want to look for some intel to support this...very quietly without W's knowledge. People texting and sneaking away then coming home very late are the best indicators of an active A.

You are not alone in this denial...just like the other 2,567 LBH's here who proclaim "not my wife!" from the top of the mountain only to discover weeks/months later that she indeed was sneaking around with OM.