Hi Nighowl, really sorry your going through this. lots of good advice on here. I have been in similar situation e.g. ex-husband saying that ‘I left him’ (not the case), sticks to this narrative today, it is solely to manage his image to others, and a good line to spin the kids.
One of the hardest things about my own situation is that I just could not get it through my head that the father of my children could do that to me, or that people could be like that. But they can, and you need to think as clear as you can, and see him as someone who you need to protect your interest from, as he does not have your best interests in mind (which says a lot about him, not you). Don’t agree to anything – verbally or via email, get a good lawyer, and make sure you get his pension contributions disclosed as you will be entitled to half of that. My lawyer was rubbish really, not good at providing information and they charge you for everything, so keep advice to a minimum and work out what you want so you don’t keep having to ask for advice. If your ex is anything like mine, he will start ramping up the pressure on you now, wanting things agreed and finalised while you are still getting your head around it all, as it’s a good tactic.
Like others I suspect the 50/50 is about CM, but if he is a high earner you need to be flexible and available, you can’t do that with 50/50 and it might not work out. Just don’t agree and let him fight it out. Don’t let him threaten and push you around. Thankfully my ex did not want 50/50.
As for his line about; if you hadn’t met me you would have nothing’, if he hadn’t met you, he would not have a family, and the sacrifices you have made to build that. Some only see value in money and material things which to them are ‘something’. Not the demanding daily work you have put in which is ‘nothing’. My ex was like this, they only value material things.
Take good care of yourself, get some time to yourself when you can, relate can be useful to talk through feelings. You will come through this, life will get back on track and though anyone would rather not have to go through this , you will be much stronger and wiser for it.