He is behaving agressively, he's petty, and apart from very basic parenting - bringing the kids to and from school - it sounds as if he is contributing nothing to your life, and is a very poor role model for your kids.
I think you need to focus on your exit, don't get involved in tit-for-tat actions with him, it's a distraction, and he could get nasty. See a solicitor asap and get everything sorted re leaving.
Present him with a fait accompli - it's over, he's out, or you're leaving with the kids, you don't want couples counselling, but you should agree to mediation to sort of access, family home etc. He might want a second chance, as he's losing his cushy lifestyle, but as a pp said, he's treated you with contempt, and I don't think there's any coming back from that.
And while people may be saying that he's so great to look after his kids, I'd say at least 90% are thinking 'what does he do all day? He has it so easy!', but feel they have to say something nice to cover up their judging.