WHy did he change his mind about coming into my room?

Hey my name is Paula and I'm 17 years old :) I have been seeing Jay for almost a week. I like him he is handsome and older 23. We had a great first night together that ended with me sucking him off. He come in three minutes. The following night we went on a second date. He asked could he sneak in my room. I said yeah. Then he asked who lived with me and did I have my own room. I told him him I have my own room with a lock on the door and my mom dad sister and older bro all live with me. He became angry and said never mind. Why did he change his mind I thought he liked me? Also do you think he wanted to have ?