From my 32 years of experience in Thailand, I have heard stories and witnessed firsthand how people lost their homes and cars because they bought and registered their property in their wife's or girlfriend's name in Thailand.
First, when buying a house or car, do not register it in the woman's name.
If you cannot secure your rights in the house, you should buy an apartment, not a house. This is easy. Registering the apartment in your name and the car in the same way. Instead of the woman controlling you, you are the one who controls her and runs her as she pleases with you