My girlfriend said for the first time that she would stay in a four-star hotel. Why?

I don't know which city you are in and what the price is. Since she promised to live together, she may have a crush on you, but she is not sure whether you really like her or not. Maybe she offered to stay in a four-star hotel in order to test whether you are willing to spend money for her. (Just a personal feeling) Don't think too much for the time being. Keep dating and give it a try. Maybe you won't be confused anymore ~ ~ ~