Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
How long had you lived together?
How much is the house worth and how much is outstanding on the mortgage?
What other assets are there and what income do you each have?
Are there any children involved?
How much would a suitable one bedroom property in the area cost to buy?
Would you be willing to start divorce proceedings if necessary?
He certainly has the right to return to the property if he wishes to - but in the event that you decide that it is time for a divorce it is very likely that you will receive all the proceed sof the sale in order to rehouse yourself
Whether you will also receive spouse maintenance is harder to assess - but is likely
Please ask if you need further details
You are most welcome - I hope all goes well