How do i cope with my boyfriend's changing behavior?

.he used to be this ideal boyfriend. since he won this modeling competition, he started being such a jerk. before, we always hang out together after school. now, he’s like rarely available. the biggest blow was when he told me that everything that my family and i have is nothing compared to what he and his family have. and he said this after he got pissed off by my 8-year-old brother over the use of laptop.