Meet the parents

Hey guys so I have been wanting to tell my parents about my boyfriend. But they are very strict no sex no dating focus on college and masters and Ph.D. But I have already had Sex. And dated and I know he is the one. How do i break it to them that he is the one I'm seeing. We are a very traditional family but I don't share most of the same values. I don't want to kill them in heart break since I am supposed to be having an arranged marriage!