"Allow me to explain, Houjou-san," Saki said. "Feel free to ask Mayuzumi about the details."
Shouhei Hirai was a handsome, relatively popular guy in college. He fell in love with Mayuzumi and attempted to woo her, but Mayuzumi didn't have any feelings for him and rejected his advances politely.
Another boy was also attempting to woo Mayuzumi, and Shouhei ended up coming into conflict with his love rival.
Afterwards, most likely due to his anger and frustration, Shouhei blindly believed some unfounded rumors and misunderstood the type of person Mayuzumi was. Not only did he viciously shout at her in front of many people, he even did some rather rude things to her.
Mayuzumi was frightened by this and started ignoring him.
Shouhei later learned that he had been mistaken and regretted his actions. He apologized to Mayuzumi and sincerely asked for her forgiveness.
Mayuzumi forgave him, but she still remained distant from and avoided him.
