LW1 you don't have a marriage. You have a frosty roommate situation (I've never even had roommates that nickel-and-dimed like that!). Get out, and get counseling to find out why you accept bad relationships. 

Use the money it would have cost you to pay "your half" of the repairs on a lawyer instead. You may find yourself walking away with half the value of the house and half his inheritance-interest included.