You and Alexander were just friends, but he kept visiting you in your apartment without any reason, or he just wanted to make you feel annoyed.

One time he visited your apartment, and of course you opened the door. You could see his smirk disappear when he saw a man behind me.

You were about to explain that the boy was your cousin, which you didn't know it was since he lived far away. Before you could, he had already started walking away.