Because you wanted a different outcome like we all did – that happy ever after, you’re maybe hoping for that epiphany moment where he’ll see sense and realise what he’s got and be the nice guy we fell for; or at the very least become civil about splitting up! And because you’ve been conditioned by him. Downtrodden to believe his negativity or made to feel guilt ‘for splitting the family up’. Urgh, they all say it.
Throw in the fact they elongate the ending to meet their needs, rather than accepting it’s over and discussing next steps & who is moving/when they keep us as roommates living in limbo. It’s tough but focus on what you need to do next for you & the kids, he’ll be grumpy whether you stay or go , so work towards the new beginning for you xx