Huh. So I tried to look it up just now and I'm not sure if I understand the difference. (To the extent that there is one - apparently one can mean the other, but I imagine they're usually used as follows.)
It looks like "jealous" is more being afraid of losing something you have (most commonly e.g. a spouse's affection) to someone else, whereas "envious" is wanting what someone else has?
It looks like "jealous" is more being afraid of losing something you have (most commonly e.g. a spouse's affection) to someone else, whereas "envious" is wanting what someone else has?