With the details provided, I think she owns the car outright. Any private re-payment for the vehicle from him to her, would need to be proved beyond a shadow of a doubt and even then may not stand up. Again with the funds that he has contributed to the home, must be proved beyond a shadow of a doubt (bank statements and notes) this would all need presenting to a solicitor. When one person, on paper, owns everything, it is very tough to seek justice for personal or private re payment but if he has a record of EVERYTHING he should seek legal assistance. CAB are always a good starting point and it is free advice. He will also be in for a long road and some people choose to cut their loses it all depends how much this means to him and how much money he claims to be out of pocket. Obviously if she sells the house, he will feel entitled to half if he put in 50% of the initial down payment and covered 50% of the mortgage and bills etc.... If he did go 50/50 and can prove it, tell him to get advice