What do I do next

[tiredtoday]

Told him I don't want to be with him anymore. He has moved all his stuff out to the spare room to give me space. We co own our business together (our only source of income) and jointly own the house, but it is in my name only.

What should I do next?

Are you married? Do you have kids?

Does your business make a lot of money?
Is it an amicable split?
Could you still work together?
Do you have equity in the house?
How are house sales in your area at the moment?

Married.no kids.
It makes enough to keep us above water. No sure how amicable it will be. Probably couldn't continue to work together. House is paid for.

The business would have to stay with the house.

I'm happy to be the one to move out and leave him with the house and business.

Sounds like one of you might have to buy the other one out, or else sell house/business altogether. You say you are happy to move out and leave it all with him but presumably you will want your equity out of it to start again?

Best to see a lawyer I think as it doesn't sound like the most straightforward split.