I'm in a similar boat to you all, Husband told me he wasn't really happy in September. He didn't say he wanted to separate though and for the next 4 weeks we still kind of went about doing our normal stuff and intermittently talking about it and me making more effort.
Then in October he decided he wanted to separate, again a couple of weeks of back and forth about maybe trying not trying etc! Ultimately he decided he wanted to separate.
Now, there's nothing massive going on, we get along well enough, sex was still good although intermittent but there's just no wow moments anymore. We have one DC who is our world and I suppose this is where things differ for us.
I think that when you have DC you fight as hard as possible and make sure you tick every box you can before you split the family up, especially as we can agree on went wrong and what we want going forward but he is of the view that your happiness is more important and believes we won't make each other happy.
So I have accepted his decision and what he is saying is true because my grief is the breakdown of my family not the loss of my DH but it's still so hard. We are having to stay living together until the summer for various reasons but things are very amicable.
We have redone finances so that even though he earns more than me we are both taking home the same so I can save. We have agreed on custody, 50/50 DC is at boarding school so it's mainly just holidays to work out. We have worked out finances - minus pensions as we just don't understand the full value yet. But they are going to be treated in their own right as we both no we are entitled to 50/50 and no arguments there.
It's a weird time as we are all still living as normal but not.
I am sorry for all the others that are going through this, it's shitty no matter anyone situations. We haven't told DC yet so that's our next hurdle.
I am using this time to squirrel as much money away so I can buy my own house (probably shared ownership as that's what I'll be able to afford) buy my own car and get a promotion at work! Little hurdles along the way!
Big hugs to everyone!