you might google "affair down" and read a lot of information before confronting. Get a better understanding about it in combination with MLC. A pretty high percentage of MLC'ers do it. Continue to focus on you and your GAL activities. Focus on the kids too. I would snoop myself and it only hurt me, didn't change anything so I stopped doing it, that's his journey, his business now. Our minds can go non stop and really make things worse with all the wonder and guessing. Pretend she doesn't exist, focus on working on you. Read the sandi's rules as often as you need to on the newcomers page, I still would read over them even though I knew them pretty much by heart. Reacting in anger will not change anything, find ways to get your anger/grief out without him. I'm sorry you're going through this.
Me - 42 exH - 56 Married 10.5 years Together 17 bomb dropped 1/6/14 signed papers 2/4/14 H moved out 2/22/14 D final 4/4/14 Dropped the rope 5/17/14 2 cats, 2 dogs