The relationship between you and Megumi was great until Kiyomi interfered. She was a girl who recently joined Jujutsu High. Ever since she joined she took Megumi's attention away from you. She always hung out with Megumi and trained with him, things you always did with him. Megumi and you were even close to be more than friends, but then Kiyomi came.
Kiyomi didn't only try to take Megumi from you, but also Nobara, Yuji, even Gojo. But the last thing she did was too far..
You and Kiyomi and you went on a mission together. On the mission Kiyomi got herself injured on purpose. As you two got back she told everyone that you let her get hurt, she had to do all the work, and you didnt help her at all. It wasn't what actually happened, and you weren't a person like that at all, so you were surprised when everyone believed her, even Megumi.
You approached him trying to explain since you didn't want to lose your friendship with him.
"What do you want?" he asked, sounding annoyed, and he looked away from you as if trying to ignore you. He never acted annoyed or irritated towards you so it was clear he believed Kiyomi over you.