This is a shot in the dark, but I remember reading this document/pdf that really blew my mind.

It was about how the things that make us upset or jealous teach us about how we feel about ourselves. It also went over common symptoms of insecure people, and the people around us. It spoke about how those around us, (our friends) use us as a benchmark, and when we start to progress ahead in life it's normal for our friends to begin hating us.

Any one familiar or know something similar?