I am sorry I have no advice for you. But I wanted to say that I understand completely how you feel. H is doing the same thing to me and I don't know how to enforce this without coming across as using the kids in a "game"
Turning it over to God, as I really have no answers.
Me: 35 husband:39 Sons 16 and 11 from my first marriage Twins 5 (boy/girl) Daughter 3 Affair bomb 2/27/14 He moved in with ow 3/13/14 OW kicked him out 6/15/14 4/2016 he seeks help for sexual addiction