There may be two reasons: first, I think this kind of person belongs to that kind of person who is particularly smooth. Just like you said, he has a brain. He likes people who talk nonsense and likes to do what he likes. Second, it may be that her own face value or ability is excellent, and naturally everyone will like her more. She used you but didn't hurt you. Don't worry. It's good for you to spend more time with her and meet more people.