"Well seen. Insecurity - fear of loss - is nine tenths of what is called jealousy, and yes, it becomes a self fulfilling fear. My mother once observed that when someone fears they aren't loved, they respond by acting as unlovable as possible."

I disagree. Jealousy is a header with many emotions behind it. Insecurity is one, possesiveness is just as common, so is envy, realistic fear, and deprivement.