It wouldnt be the worse thing to say, but to me saying you suspected or already knew. Anything like that is going to lead her to think you were snooping. I dont think it would hurt anything, I just think not saying anything like that will make you look a lot better.
M 37 W 30 S 7 Together 10 years Married 9 years BD: 12/12/12(W filed same day) I moved to apartment 1/11/13 W and S moved to MIL 1/11/13 Peicing: 6/3/13 Reconciled: 7/2013 BD2: 4/20/16 still working on it