Yep, agree that it isn't surprising at all that the OW is less attractive and has less going on. I think it makes the wayward feel more important. Who knows? In my case, the OM was good looking, but made half my income, wasn't nearly as smart (according to the W later) and had no hobbies or interests. What he did do, however, was feed my wife's ego - big time.
I'm sure that your Hs OW is seriously intimidated by you, and it's her insecurity that is causing her juvenile behavior. I'm picturing a small, mange ridden, mutt puffing up its chest and yapping at a Rottweiler. Whaaaatever....
Keep playing it the same. I see this girl being bat sh*t crazy. Your H is in for a wild ride!
