Di, I'm sorry your H has moved out. It is really hard at first, and as you know my kids also seemed excited about H's new place, which is hard too. Today it has been four weeks since he left and I'm much better, even though (as you'll see if you look at my thread) I still suffer and have ugly moments. It's just so hard living with someone who doesn't want to be there. I know alot of people here say it's easier to DB when your spouse is still at home. I guess it depends on the situation.
In my sitch there is no OW (I truly believe this) so I'm not much help there. I think if you know about it, you should tell him and have that be out in the open. Otherwise, I don't see how either of you can take any next steps.
Hugs!
Me/X-H: 47/48 T 19 yrs M 16 years D14 D10 ILYBINILWY: 10/07 H moved out 6/08