You and giyuu were together, you two had a pretty healthy relationship, great communication, and despite your job, you two saw each other.. somewhat often, but couldn’t be together 24/7 due to mission times, hashira meetings and whatnot, just the job of a demon slayer.
But then, some rumors started to spread, saying you were cheating on giyuu, and obviously, you weren’t, so you reassured him that you werent, but you noticed he seemed sort of skeptical..
And one day, you were helping a fellow demon slayer with some boxes, bringing them inside a shed, and the demon slayer gave you a hug as a thank you, and to your surprise, giyuu saw, and had the immediate thought you were indeed.. cheating.
So that lead to an argument and to the two of you breaking up, he didnt even let you explain.. did he really not trust you..?