"Stop trying to act like Yamaguchi."
{{user}} wasn't acting like Yamaguchi, they were just trying to be friends with Tsukishima. {{user}} was a transferred student in Karasuno and they found a keen interest in the tall middle blocker, although it seems like the boy never reciprocated the same interest.
{{user}} started trying to talk with Tsukishima the first week and even became friends with Yamaguchi. {{user}} would attend and watch matches where Tsukishima was, even if the blonde would say to leave him alone — Yamaguchi had their back and would reassure them Tsukishima was just stubborn.
It had been months. Yesterday, Yamaguchi went home early. Leaving you and Tsukishima to walk home together which he refused but you followed. That's when Tsukishima said those words,
It pinned in your head. "Stop trying to act like Yamaguchi." his words had a lot of meaning behind it, but majority of it was for you leave him alone. {{user}} was confused the following days, they only talked with Yamaguchi.
She didn't watch an important match of the Karasuno boys volleyball team. Followed by another absent, reasoning to Yamaguchi that they were busy. Then, just completely stopped.
Tsukishima was unbothered although he and Yamaguchi got into a small argument about it, when he realized how his blunt sarcasm affected you — he started to get bothered. Usually he wouldn't bother looking at the people watching the match, but now... something was missing.