how can u make one of ur bst frnd """cry""" ???

Since High School my closest friend cried when I keep on reminding her his ex-boyfriend, the way they call each other and when I act liked him. She always tell me that "I am bad friend" hahahah! There was also a time when we were in the comfort room of our building in school that i sang the song that keeps on remembering her all the memories of his special ex-boyfriend. She cried alot that it ended up that I must hugged her coz its kinda unforgettable. After high school, we separated coz i chose to took up my chosen course to other colleges. We still have communication. There was a time that i used a new number in my celphone and I texted her using the name of his ex-boyfriend, telling her sweet quote, like "miss you, love you" that I made her believed me, and I did not expect that she will be honest telling me her feelings to that man.. OH my! AFter she response to my messages and after she confessed her loved to the person whom she expect I honestLy told her that i make her believe me!!! and when she knew that it was me, SHE REALLY SHOUTED at my ear when we talked over the phone and there she cried that I am right she still love the person and she couldn't move on to the level of forgetting the man unless they talk and clear between them. Touching that I can make her cry but when I see the deeper side of it, my heart is also crying coz i feel the burden she carries.