Jealousy is destructive. As seen by Saul, his appreciation turned to jealousy, and he attempted to kill David. It starts with resentment, then a desire to have that person removed, then manifests itself in seeking ways to harm that person in word or action. Saul began to resent David and then actually threw a spear at him.
Love is the best weapon against jealousy.
The other day she looked at my calendar and wanted to know who May was. Envy is a sin.