Facing the Green Eyed Monster
Jealousy and envy
Almost identical twins but there are a few slight differences. Jealousy is far more complicated than envy, and also incorporates it more often than not, so I shall look at that one first.
Jealousy is caused by a mixture of fear, anxiety, insecurity, abandonment issues, humiliation and general low self esteem. It can also include envy. It is a powerful weapon to use and manipulate against someone, and yet it often is, through accusation, flaunting, taunting and other generally unkind behaviours.