@Tcof I dont think so, Yato talked about Kazuma's past here, he said a girl a year older than Kazuma came to apprentice (possibly came to learn Kazuma's father bussines). Kazuma took a liking to the girl during her apprentice but then she got married off at some point when he was 15. He got broken heart and curled up in a ball then cried. In the page 17, Yato said that he
also got someone he love, now this
is Hiyori.