Friends?

It's another one of those days when I just feel sad over everything that is happening in my life. I came back to campus about an hour ago to find L and VY watching the Staircase Implementation episode from The Big Bang series at my desk. This began to bother me since I feel that L is treating VO unfairly, and it also seems to me that she is avoiding this situation by seeking for a better friendship with VY. However, I am not the one to judge. Ever since the incident, it is clear to me that there is now a strain in my friendship with L. I've been questioning myself what a friendship truly is. Who are my true friends? What kind of a friend am I to others? I really want to know...