He wants you to be a family? That's funny because when the mask fell last night, he wanted an open relationship with you on the side for casual sex until some other lucky woman could house him and kids and be a family. What he means by being a family is you housing him and kids. For that honour, you get to have his company, but the baseline version with no coffee in bed or true care, because HE will not change, that's what 'we' means - that all this is your issue.
It's so hurtful and no wonder you are reeling and feeling the pain and loss of what it once was, but the reality is he has been using you and sharing very little. I've read this whole thread thanking your lucky stars that you never bought a house with him, and in time you'll be thanking your lucky stars that you ended it now before he ground you down even more.
Moving in after 5 months - and being resentful that you didn't give up your financial independence to feather his nest even more (despite you already letting him live rent-free) says so much about his priorities which were always self-serving even if to achieve them it meant being less selfish with you. But the 'cunt' comments while together and the instant reaction of replacing you with the 'interchangeable service provider' (so true and so sadly damning) show how his mind really works. He will never, ever put you anywhere near first and he's pretty shameless about that. He will not entertain the idea, even while guilt-tripping you for kicking him and his DC out, knowing that you're so much more caring. It's disgusting that he's doing that after showing his true colours. Please stay strong.
You'll have many moments of regret and wanting him back, but he's not the one. You matter so much more, and your 40s will be so so much better, I promise.