My boyfriend offered to stay in a hotel.

The problem is you, this girlfriend! You tell a man that you want to stay up all night and can't find a place to go. That's a hint. If you are a simple boy, you will think you are very casual. You held out an olive branch and said he was casual. You should analyze this matter rationally. It's entirely your own fault. As a woman, you can't talk too casually, and you will become "casual".