I honestly don't know what to tell you. I don't know if I agree w/ the telling parents, kids, etc. about the A. I don't get how your H can continue to deny it even when you are confronting him w/ the emails, etc.
I think you are going to have to make a choice as to whether you are willing to stay w/ him if he is going to continue to have the A. You say you love him and you've done all this DB'ing, however, if he is continuing to cheat on you, you are going to have to decide if you can live w/ that. If you can't, then you may have to do some things that may make him angry and may ultimately push him away. You don't know how he is going to react or what he's going to do until you do certain things. You unfortunately can't have it both ways.
I would say confront him again, tell him you will not put up w/ his continued contact w/ her. Then you will need to make a decision as to whether to tell her that he is married. I would start there.
Me: 38 H: 35 S4, S5, S10 Bomb 01/07 Wanted D - nothing would change his mind Numerous A's prior to D bomb; EA prior/during D bomb Piecing 04/07 Deployed for a year 05/07 Still Piecing 2010 M 11 yrs 05/10