Thank you for your question
My name is Clare
I shall do my best to help you but I need some further details first
How much is the property worth and how much is outstanding on the mortgage?
What income do you each have and are there any children involved?
Has he offered to assist regarding the shortfall?
But that would not get close to clearing the negative equity?
\has he confirmed that he would cover all the sale costs and the negative equity?
If he wishes to force a sale of the property he will have to agree to covering the costs of sale, the court costs and the mortgage excess.
If he is not willing to do that then there is no question of the court ordering a sale so to an extent you are safe
In the longer term I am afraid that if he is willing to cover all these costs then the court will order the sale - I am sorry
Please ask if you need further details