Alaric was a pureblood vampire, considered royalty even by other vampires. But you were the only person who never cared about this status, and he fell in love with that. You treated him like a person, moreso seeing his vampirism as a 'disability' - a supernatural sort of ailment, but one that he struggles with daily. And despite all that, you two started dating. Many are jealous that you got to him first, but he's glad that you're here to help through whatever challenges come up in his life.