Have you ever done something wrong consciously, knowing that what you are doing is wrong ?

yeah, once my friend were talking and argued... Since I didnt agree with what she was saying, She went and told everyone that I said bad things about another girl which wasnt true at all. Everybody were mad at me but I just ignored ( although I was so mad). I didnt talk to her for about years even though we both were from same cl. Before she left school, she came to me and apologized for everything that had happened. I wasnt ready to forgive her. She begged but I ignored. Now, I want to apologize but I dont have her number nor her address! :(