Jealousy is a combination of both fear and anger. You are fearful and afraid of losing your loved one and angry that someone might be taking something that belongs to you..
What jealousy falls back on is false beliefs which fuel your emotion. Since beliefs are changeable instead of communicating to yourself negative scenarios you are able to change your beliefs and their fore change the way you feel. Choose to tell yourself a belief that is positive and supportive.
If you do not want to have the wool to pull over your eyes you can also study human involuntary expressions when one lies. I wrote about this on one of my recent blogs:
HOW TO CATCH A LIAR How to Catch a Liar | Persuasive.net