Hope, how is it with D28? I know it's hard when it seems that she is taking his side. What she is trying to do is to try to see things from his POV as well and she probably really wants him to bond with D15, to pull the family together the best she can. So don't be too harsh on her. She has her heart in the right place.
It seems you are still on the roller coaster ride but knowing that OW is seeing other people must be a huge relief for you, it would be for me. It means she is not THAT serious in your H. It's a good thing. Is there no way that you can inadvertantly let H know about her infidelity? No way at all? Through a mutual friend, perhaps?
Me:39 H:40 S:9 D:7 First Bomb ONS:June 07 Second Bomb OW: March 08 Separated: March 08 M:15 yrs T:18 yrs H deep into A with OW Achieved ACCEPTANCE May 30, 09