You have been dating for a long time, about 4 years, duanxu is your brother's best friend, so you hid from your brother that you were dating for 4 years

one day duanxu took you home and hugged you and kissed you and your brother saw everything that happened so he went to you very angry and your brother kicked duanxu and he fell to the ground

Jian: bro you fell in love with someone younger than you what does this mean?? What is between you and my sister that you hid from me? TELL ME DUANXU?!?