Jealousy

Why we covet things is a personal choice. What value we place on other items is totally based on our desires and want.  However, what happens when the objection is denied us?  We try even harder to obtain that which we cannot have.  What happens if we do gain the item?  We try even harder to prevent someone from taking it away from us.   We go to great lengths to prevent it being taken.  How much does this cost us?  In time? Money? Relationships?