You weren't to know right at the beginning @mummy917 that he'd already made up his mind to leave, or just how much of a prick he was going to be.
It's natural that you wanted to try to keep your family together, for the sake of your four children.
You've come so far since then, and realised that there were issues in your relationship that YOU were unhappy about. You were carrying him for a long time.
It's still early days in your 'new normal' life, things will settle down. Just keep putting your DC first, as you always have, and you won't go far wrong.
💪💐💪