Also "moving in together" is supposed to be fun, discussed, decided together.
It's a big relationship step that should be exciting.
He has effectively taken all that from you.
This is not, and never should be a just his decision, especially as it's your house
Moving from his mummy to his girlfriend. Really OP?
You have no idea, neither does he, if he can, will, pay, chores, be responsible.
I always had a rule to never live with a partner if they were straight from mummy. Not a chance.
I would say this.
Why don't you get your own place first, see how that goes. I reckon his response will tell you everything you need to know.