"Can anyone advise me what to do."
Go and see a solicitor, discuss your predicament and consider looking for a Judicial Separation. If you and your ex husband cannot agree on what to do, a Court will make orders for you.
If the property is owned jointly, then yes, he has a considerable claim on the property. You gifted your money into your marriage.
The abuse is regrettable but it is unlikely that it will materially affect the distribution of assets in a Judicial Separation case. Of more relevance is your individual financial circumstances and the maintenance and welfare of the children.
mf