My mother was in a car accident and died. Her boyfriend's name is on the title and financing of the vehicle. She made all of her payments on the car. Is he entitled to all of the money since the car was totaled out?
I am sorry for your loss and the most important thing is to remain calm during this difficult time. The tone of your question suggests that there might be an adversarial relationship with the boyfriend.
"All the money" is a vague term. So let us break it down a bit.
The car: My assumption is that the car was totaled. So first, the insurance company will pay the bank that holds the note on the car. If the car was worth less than the loan there is a shortfall, and the owners may have to pay the difference. That sounds like the boyfriend. Likewise, if the car was worth more than the note, he would get any left over money.
Boy friend's medical bills: he is entitled to have his medical care, paid for that resulted in the accident.
Liablity: The boy friend may have ground for a liability suit. If he does, and he wins, yes he is entitled to all of that money.
However, you (and the heirs of your mom) may also have grounds for a liability suit. If you win such a suit, then you are entitled to all of that money.
It is tricky to navigate things, so this is the best advice you can receive during this difficult time is: Get a lawyer.
I would avoid talking to, and certainty not arguing with the boyfriend. It does not accomplish anything other than make you upset in an already difficult time.