The planet of extremely dense fog, that's for sure!
LOL!
Joking aside, in his mind, this is the perfect solution! He can get all his needs met under one roof. If you and OW would just go along with it, life would be perfect. Because it's all about HIM.
NOT!
I'm with the others - keep doing what you're doing. If OW is pressuring him and you're not, he's going to get tired of it eventually. Let the sparkle wear off the fantasy.
Meanwhile, continue to be evasive about your dating status. Go for dinner and drinks with friends. Take a vacation. Let him know you're moving on WITHOUT him. It may be enough for him to wander off that planet of extremely dense fog...
BTW, most MLC last from 2-5 years. Given the time line, I think you're either in late yr 4/early year 5 given all the bar hopping that started in 05. He should be waking up from his daze soon --