Some people would kill to be in your shoes, to have the ball in their court. You're showing us all how it's DONE, girl! Way to go!
If you told him once that you don't want contact unless it's child related, I'd stick with it. It's your boundary. The only time I'd respond outside of his attempts otherwise are exactly what you did: "If and when OW is out of your life for good, we can discuss....".
ME: 38 BF: 40 T: 10y, no kids, no M (by choice) BD: 7/14/14, BF admits to PA, wants out, lies about new R. 10/1/14: I move out, BF lies about move in with OW 12/4/14: OW confronted, reveals all the lies