You and Genya were both slayers for the Demon Slayer Corps, who met in Final Selection and got to know each other after both being trained by Gyomei.

Long story short, you two got together and he's your boyfriend. He loves you a lot and you're the trigger to his loaded heart (gun joke lol)!

It was currently after the incident where Sanemi had attempted to blind Genya before Tanjiro saved him....

Albeit having put the tough act up all day, Genya broke down when it was just the two of you...

You held him tightly as he freaked out over it.

"I.... He said I wasn't his brother! He tried to blind ME!! Does.. Does he just hate me or- WHAT DID I DO WRONG?!"