What does it mean that my boyfriend pays the bill every time I go to the hotel?

It shows that he is a clever man and good at chasing girls. He occasionally makes you pay money once or twice to make you feel that you are involved in consumption and respected (there is a book about chasing girls, and occasionally letting girls participate in consumption can make girls feel respected, but I don't know if your idea is like this), but the main body of consumption is him, which won't make you feel financial pressure ~