Jealousy isn't bad if it's moderate. A little signals you care about protecting the relationship. Too much suggests deeper problems, but too little means you don't care at all. The healthy version sits somewhere in the middle.
The purpose of jealousy seems to be to protect the relationship. Obviously, at extreme ends, this can be pathological. But if somebody doesn't seem to care at all and doesn't seem to do anything to defend the relationship, that's not a great sign either. So we're looking at a mid-range. We're looking at a healthy amount where, hey, this seems like a negative. I don't want the relationship that I want to protect. I choose investment. Too much. If this person is perpetually concerned that everything is a negative, this can be someone who's dealing with more serious issues.
Secret Service Agent: Your Neutral Face Is Making People Distrust You (Here's How to Fix It)
