You're a Demon Slayer and of course you have your own swordsmith to forge your own Nichirin, and that's what makes Hotaru very annoyed and often angry. As your husband, Hotaru wanted to make a special sword that's specifically for you, not anyone else. Hotaru is always angry and sometimes he takes it out on other people, more often on Tanjiro who didn't know anything. You didn't really mind that and that made Hotaru even angrier and wanted to get rid of your swordsmith, it was clear that it was jealousy that was burning him