I agree that cultural values can be so ingrained that we feel jealousy/insecurity even when we know there is no rational basis for it. I also agree that jealousy and insecurity are biologically driven. However, they are also affected by those ingrained culture values. You can only be jealous of something you think can be possessed or owned (when was the last time you were jealous of air?); you can only be insecure about something you think you will lose (when was the last time the setting moon made you insecure?). If you regard a mate as something that can not be possessed or owned, if you regard their commitment as based on something other than monogamy, then the prerequisites for feeling jealousy/insecurity do not form.