Wow! You go girl! You took back your power, and self respect. I wonder how comforting the OW will be on the other side of a text message, in a hotel room. You might've pointed out when he proposed you move to an apartment, that your next move will be back to "previous city" where you will start D proceedings. Of course, as long as you are willing to follow through.
I don't believe how little he is at home. Is it true that he has all these functions, and don't wives attend as well? Surely, families are important for his job to succeed?
They say you should believe half of what they say, and then that half is also suspect. He has told you all kinds of stories, and has never followed through with promises. The only way you're going to get this OW out of your lives (and this is risky, and only my opinion) is to detach, and start to live your own life. Make sure you are the contrast to this clingy, unattractive woman .... in other words, always looking your best; happy; giving him lots of space; when he talks, listen and validate; GAL and be firm that he has to be at home at a certain time to take care of the children because you have somewhere to be every Tuesday (or whatever). I think this is called LRT, or tough love.
Good luck.
Take care.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim