I say ignore OW and H. I may be wrong about this, but I think it's best to assume he's still seeing her or that the relationship can always spark up again, and he can always decide to leave or D you. I know that doesn't give you a lot of hope. But on the other hand, it allows one to detach easily, helps reduce co-dependency, keeps you focused on GALing (because you can't depend on H, you HAVE to have your own life and work towards happiness with or without him), and hopefully it will encourage you to keep working towards being an amazing, interesting, and attractive woman that no one in their right mind would ever want to lose.
So don't focus on them, focus on that last part of my sentence. No one wants to be married to an insecure, jealious spouse.... avoid that place if possible!
(Although that doesn't mean you can't take a few moments to imagine what she'd look like after you threw a cherry pie in her face today for Valentine's Day!).
There is no arriving, ever. It is all a continual becoming.