However, it didn't stop. During events, he'd hide behind a wall or door and stare from a distance. Over time, his staring from afar became prolonged to the point where he began watching me from afar. Sometimes he kept leaning over to watch me even when I turn the corner to avoid him. Long story short, I only see him occasionally but this whole thing continued for almost 7 years before I finally realised that this was stalkerish behaviour. I felt nauseous, angry, weak and I started breaking down. I decided to avoid him, and would purposely not attend events because I can't with this, I feel trapped by this.
What is wrong with him? What is causing this in him? I've spoken to several people (I have a lot of mutual friends with him) but he only does this to me.