In general, jealousy is an ugly trait. When you recognize jealousy within yourself, it typically is an indication of your own insecurities. Unfortunately most people don’t make that connection… which is why jealousy is generally unhealthy.
But, every so often, jealousy can be healthy. Healthy jealousy is that feeling you get when you didn’t notice how hot your date looks (and didn’t give them a compliment either), but catch others checking them out with admiration. At first you may get pissy and feel that others are disrespecting you by checking out your date right in front of you — that’s the jealousy. But then you realize that your date is hot and they deserve to know you think so — that’s the healthy part.
Sometimes it takes that little bit of that green-eyed monster to help you appreciate what you have sitting right in front of you.