Does that mean we have to be slaves to our genes? I hope not. People like Sam Harris and others offer all kinds of methods to detach and "win" over our biology.
So it's just a feeling. What you do with it (actions) is up to you, most people don't act upon those feelings in any noticeable way.
But if we are being honest with ourselves constant feelings of envy often do lead to a deteriorating relationship (usually in the form of the person feeling envious choosing to distance himself from whomever he's feeling envious of), simply for the fact that feeling envious feels like crap - and when you are feeling envious of a person you actually care about it feels double crap (you feel envious and guilty at the same time).
Is the answer generally just "it is what it is?" That's so dark.