Well done for taking charge — you already sound much calmer.
At every step, ask yourself are you putting yourself and your kids first, or him? Are you in control, or is he? Aim to be in control - you’ll feel so much better even if the choices you have to make are horrible, at least they’re on your terms. He won’t like you for it, but that’s not relevant anymore - he doesn’t care about you sadly. Only himself.
My guess is that he’s reluctant to rush into divorce because it wouldn’t be in his favour. Keeping things vague gives him a chance to try out his new relationship while knowing he can fall back on you if it doesn’t work out.
Nothing will drive home what he’s lost (maybe not right now, but in the future) than forcing him to live fully with the consequences of his choice, without the comfort of a fallback. Take that safety net away. He may never regret his choice, but it’ll be harder for him to live it if you’re not pandering and making it easy for him.
You are both single parents with independent responsibilities now. His choice, but you need to start setting up your life on your own terms. Right now. Make sure he’s sharing responsibility for the kids so you’re not left with 24/7 childcare. You need to have the time and space to rebuild an independent life - and who knows, maybe even meet someone yourself. It’ll also make his new “single man” lifestyle more complicated. If it’s harder for you to date again, why should it be easy for him? Switch your phone off when you go out while he’s got the kids. Well done for keeping comms to kids only, but don’t use it as an excuse to contact him. Only contact about him about the essential - be really strict with yourself about this.
He’s shown that he either exaggerated his depression as an excuse to leave, or it was situational depression that conveniently lifted once he changed his situation. Either way, he seems perfectly fine now — not remorseful, just relieved. So don’t trust him blindly. He’s not the man you thought you knew. He’s proven he acts in his own self-interest.
I’d be really cautious about what he is or has been planning. He’s fundamentally untrustworthy and unreliable. He may already be moving assets. I hope you’ve gathered all your financial and asset records and have spoken to a solicitor. Have you agreed childcare arrangements with him and filed for CMS?
He’s only been playing nice because it suited him. Don’t be caught off guard when he decides to push forward with the divorce — be ready, and know exactly where you stand. Or pull the trigger yourself if you feel you’re ready and if it benefits you.
Don’t let him live a carefree life at your expense @poppymolly!