I absolutely detest insecurities and jealousy. Having said that, each party should not be doing anything to cause it. That is easier said than done though, as some people cannot help being jealous in situations that many people would not be.
Each couple is different and so is each situation. Many people will know of situations when they have disagreed with a friend's jealousy and yet will have their own situations where others have disagreed with them too.
I am a man who loves a relatively stress-free life and thus married someone I trust and that trusts me - I think . Life can be complicated enough; why involve others?