This.
Plus
"He’s now saying he’s done with her and having any kind of relationship."
What exactly does he expect you to do? Abandon your DD?
She has apologised and said it was said in a "Rant". She didn't know he was listening. But now he has laid down the law... only 4 months after moving in.
Why do you think your DD was so keen to get the responsibility of a house at such a young age. Its well known that moving house and taking on a mortgage is a stressful time. Its a lot of organisation for such a young person who was probably feeling overwhelmed.
If she doesn't have a sofa, presumably she needs it to sit on in the new house/flat. She needs you and being told that you are meeting partner's relatives, probably felt displaced because, she has actually already been displaced by your partner and that is why she's moved out.
Let's face it, moaning about him wasn't the crime of the century. It can't have been easy adapting to having a new person in her home. He's supposed to be older and wiser and he ought to be able to manage his feelings ( out of respect to you!) and find a way to manage the situation, talk to your DD and patch things up.
Instead he decides that the only way he can deal with it is effectively to make you choose, your DD or him.
What a massive red flag.
So I take it he won't let you invite your DD to the wedding then?
He's an immature manchild.. who is also being very controlling. His feelings are way more important than yours aren't they? A man you've known 18 months or your DD you've brought into the world over 20 years ago.
He doesn't think that its worth trying to repair the relationship to make you happy? He's happy to pressurise you into throwing that away to please him?
Your DD has moved out..so its not like she's expecting him to have to see her every day.
I think you should be VERY CAUTIOUS about someone who has such hasty knee jerk and frankly punishing reactions to something they don't like. There is ALWAYS A BETTER WAY TO DEAL WITH THESE THINGS. He just can't be bothered to look for one. What happens when your 17 year old is caught moaning about him. Are you supposed to cut her off too.
Yes you have the right to build your own life and move forward.
No your partner does not have the right to make you choose between him and your child.