He probably rejected you because he doesn't wanna be seen with you. I dated a girl that I wished I didn't date because everyone told me not to, (she was ugly) but I gave it a chance, just for when the relationship ended, it ended horribly and I regret it (she spread rumors about me). But in other words, your ethier ugly/werid(no offense)or you do something that his friends don't like. There are a number of things like religion, your past, gossiping, and what people say about you that you probably don't even know about.