Biting the poison apple. Got to stop doing that. His choice and he likes what he likes !
Good for you!!!! Very positive...
Not everything is visible, and sometimes we just have to let go. But even if he does end up with her, you lose nothing by being nice. Just lose the expectations, stop being mad about stupid things (it will only make OW look better), and concentrate on your own life.
There is no arriving, ever. It is all a continual becoming.