Strad - I'm glad you haven't name-changed again for this, but it is such a bloody waste persevering with this utterly dead relationship.
He doesn't love you. I'm not sure he even likes you very much.
I know that seems harsh and stark, but when ever I read posts from you about your marriage - whether it's about his parsimony about buying crockery and curtains for your palatial, but sterile home, or the passive-aggressive games you play with eachother, I want to scream, FGS get out of this destructive relationship woman!
For some utterly bizarre reason, you two have become co-dependant on eachother in this miserable, arid marriage.
I can see what he gets out of this to an extent. He gets his children cared for, keeps his assets intact and isn't socially embarrassed being married to you, but I haven't a clue what you get out of this deal. And your children are having a greatly impoverished childhood by the role model of a marriage you have both provided.
From what I remember about your H, he has never forgiven womankind after being abandoned by his mother, favours your son over your daughter and treats you with barely disguised contempt.
You seem to have a myriad of responses to this behaviour - confrontations every now and again, but more often, passive-aggressive game-playing such as leaving the Lundy Bancroft book lying around, threatening infidelity, flouncing and dropping bombshells that you never follow through on, engaging in a secret relationship with your exH. You've made so many threats now that your H simply doesn't believe you any more. He is contemptuous of you, which is the point of no return.
If for nothing else, I wish you had the courage to give your DCs a better model of how adults engage and resolve conflict.