Everything he had before marriage is his alone, everything acquired during marriage including any money is split 50/50. If property is involved built or bought during marriage is 50/50, the problem comes when he tries to sell the house (not land it’s standing on) as she can make things extremely difficult.
Get your <deleted> together and walk out the door and put many miles between you and her and then reassess the situation from a place of safety.
I understand you don’t have much money, but chalk the house down to lost money, then anything you do manage to get out of it will be a bonus.
A lawyer is going to be needed sooner or later to legalise divorce and property split, if that ever happens.