Curt hope you're doing okay today and he's not bothering you. (fingers crossed!)
I've come to the conclusion that stbx will never be happy.
He wasn't happy with us - he didn't like the day to day tasks and chores that having children involved - medical, dental appointments, school runs, kids fighting, bedtimes, tidying up after them, laundry - all that stuff. He didn't like the fact that we couldn't just drop everything and go on holiday (or that we couldn't afford it) or that we couldn't just go down to the pub for the evening without dealing with a sitter (an impossibility anyway with DS1's disabilities).
He wasn't happy when we separated - he didn't like to be tied down to regular visits, he didn't like having to pay child maintenance, he didn't like to have to be reminded that he was still actually a parent with responsibilities, he didn't like living with his mum, he didn't like not having someone available "on tap" for sex, and he didn't like not having any money (no benefits).
He wasn't happy when he went with OW - he was still tied down with children (although he wasn't technically responsible for them I suppose), he didn't have friends, he didn't have a job (as he quit his), so he didn't have money.
He isn't happy now that he's separated from OW and back at his mum's.
But he's actually got the freedom from any child-related responsibility. He doesn't have to do school runs, ill children, doctor or dentist appointments, eye appointments, bedtimes, nighttime wakings, laundry, making meals for the kids. He can go to the pub whenever he wants, sleep in, do what he wants with his free time, he's not tied down. And yet... he's still not happy.