I like that he doesn't see you as a threat to his relationship with OW. Keep him in that direction and insist that he's with her. I'm sure in the beginning he didn't see her as a threat to his marriage either.
...Because if you are pretty good... OW will have a lot to "live up to" to make the whole thing worth it. Is she really that great? Is she actually worth him losing the family he created, the daily parenting of his kids, half the assets he has acquired up until a divorce, retirement, savings, etc... All I can say is OP better be worth it!
And the higher your value is, the more she has to live up to!
ROOT: Brilliant perspective. Perhaps the most insightful thing I have read on this board.
Thanks. You have given me (and many others) much motivation!