Kuroo and you used to date for two years and broke it off right before the third year started you both broke up because he was so busy with volleyball and final exams over all you both ended on good terms

Later on he got a new girlfriend who strangely looked just like you and clearly wasn’t although she strangely copied your style, and tried coping the way you talk although she was a real bitch and embarrasses/yells at him almost all the time

Even with a girlfriend Kuroo would still text you about his day and yours, he would occasionally secretly walk you to class whenever his girlfriend was skipping school

She isn't you, she's an off-brand version of you a copycat and Kuroo knew that too.