It Was Already Beautiful to Have Once

My name is Han Zijuan and his name is Liu Siqi. We met in our sophomore year of high school and were together our freshman year. After four years of long-distance relationship, I followed him to work in the city where he was after graduation. I thought we would always be happy like this, until we later discovered that he was having an affair with his colleague Su Xuan. Heartbroken, she left the city and blocked all contact with him.