Do I have legal rights to the vehicle??

Ok, I live in Texas, and my boyfriend of 7 years is leaving me and our 1 year old son. We have lived together for seven years and share the same bank account. Three years ago he bought a car for me in his name, I am not a co-signer. The payments have come from our joint bank account where both my and his paycheck is deposited. Now, whenever he wants to be evil, he takes the car away from me...won't let me use it to get to work, nothing. He says I have no rights to the car, that it is only his. I completely depend on this car for my and my son's wellbeing. Do I really not have any sort of rights to this vehicle????