In the past, the correct usage was:
envy = desiring what belongs to another
jealousy = apprehension that what you have is desired by another
The words have been misused for so long that they've almost become synonymous.
Right but if you must be pedantic in 2017 there are
multiple correct usages of the word "jealousy." In my use please see definition #1. I think you are referring to #5. Neither are wrong but I wasn't using the word as you interpreted it.
adjective
1.
feeling resentment against someone because of that person's rivalry, success, or advantages (often followed by of):
He was jealous of his rich brother.
2.
feeling resentment because of another's success, advantage, etc. (often followed by of):
He was jealous of his brother's wealth.
3.
characterized by or proceeding from suspicious fears or envious resentment:
a jealous rage; jealous intrigues.
4.
inclined to or troubled by suspicions or fears of rivalry, unfaithfulness, etc., as in love or aims:
a jealous husband.
5.
solicitous or vigilant in maintaining or guarding something:
The American people are jealous of their freedom.
6.
Bible. intolerant of unfaithfulness or rivalry:
The Lord is a jealous God.