I would say to trust your gut feeling. H lied extensively to me about his whereabouts and actions last fall, when he went to visit OW three times. I was extremely suspicious and asked him straight out all three times, but he denied and lied about where he went, really elaborate lies. He even called me when he was driving home from one visit with OW (supposedly had spent time with a buddy) and shared what a wonderful vacation he had had (this was Thanksgiving, I was crushed that he refused to talk to me on the holiday) and I could hear in his voice how happy he was. That was and still is very, very hard.
Regardless, I knew. Every time. I just accepted his lies because they he was so insistent and I didn't know he was capable of lying to me like that.
Right now, he says he would not have done this if he could do it over, he is ashamed over it and feel bad. So there is hope that this phase can pass. I hope he is telling me the truth now.
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17