Taming the “Green-Eyed Monster.”

The right way to write about it:

Jealousy is an intensely possessive feeling about something which belongs to YOU.

Example; Little Bobby was jealous when his new kitten sat in his sister Betty’s lap.

Envy is a wishfully possessive feeling about something which belongs to SOMEONE ELSE.

Example: Betty envied her cousin Billy his Shetland pony.