Just so I am clear are you trying to find out for your own knowledge or are you trying to build a legal case against him?
With all due respect I think you have plenty of intel and you are in a bit of denial (I know, it hurts like hell so please don't think I don't have sympathy for the pain an affair causes).
If you are doing this to build a legal case then I really would let your legal counsel advise you on how to proceed.
I know it's best not to always assume the worst but when *any* signs of an OW/OM start creeping in they usually are true.
