Saw an old friend

Today I was biking home and I went past my friend’s house. I hadn’t talked to him in over a year ever since he sorta drifted away and I found out he left our school and was doing home school. He saw me go by and I saw him so I stopped and we talked for a while. Looking back I can see now he was depressed (when he left school) but I couldn’t see it at the time. It wish I could have understood at the time but this just makes me realize nobody who hasn’t felt this way can understand.  It made me realize how truly isolated it makes people.