My girlfriend spends my money every time we meet. She wants to stay in an expensive hotel. She eats expensive food and cheap food when she is alone. I always feel reluctant to spend.

From my point of view as a girl, she certainly doesn't love you as much as you love her. If she really loves you, she will definitely consider you. Such people are generally a little selfish, that is, more important than anyone else. She is a little vain as you said. It is estimated that she will let you go if she meets someone who can spend more money for her than you. But I'm just expressing my opinion