What exactly is the narcissist's last trick, and why does it have such a strong psychological impact on their victims?

My boyfriend acts really differently in person than he does in text (new relationship). He’s nice through texts but it’s like a different person in real life. How should I bring it up to him?
I want my celebrity crush. I would trade my mother to be with her. I hate her boyfriend. I need her like air. Am I right?