AITAH for not wanting to share my car with my girlfriend anymore?

I (25M) have been dating my girlfriend (21F) for about a year. She doesn’t have a car, so a few months ago I started letting her use mine whenever she needed it. At first, it was fine — I work from home and didn’t need it every day.

But lately, it feels like my car’s become hers. She’ll take it without asking, forget to refill the tank, and leave it messy — makeup stains, empty cups, random stuff in the backseat. Last weekend, she took it early in the morning without telling me, leaving me stranded when I had plans. When I called, she said she “figured I wouldn’t need it.” She came back late that night with the tank empty.

When I told her that wasn’t okay, she got defensive, saying I was being controlling and “acting like her dad.” Now she’s upset and telling friends I’m overreacting about “a car.”

I don’t think I’m wrong for asking her to respect my things. It’s not about control — it’s about basic courtesy.

So, AITAH for telling her she can’t use my car anymore?