Hi,
sorry to hear of this. he cannot stop you by law from entering the house until you or him have been taken off the mortgage and the deeds. I know this as I have been trying for the last 2 years to get my ex-husband off the mortgage and deeds and until this is done, he has full access to the house (which I hate as he could just come in).
you will need to work out what will happen to the house, for example will he buy you out and if so. I would get the house valued and then you can work out what will be paid to whom.
happy to chat more if you want too xx