4. Lately Jeremy has been acting very strange. We used to hang out together all
the time but now he seems to keep to himself most of the time. I thought he
might have been depressed but then there are times where I've seen him at
parties seemingly having the time of his life. I even heard he's into doing drugs
now. I don't understand why one day he looks and acts so sad but the next he
seems so happy. What do you think that Jeremy is suffering from?