Why is She Jealous?

Why is she jealous?
She can have anyone,
I love him,
He loves me,
So whats wrong,
I don't seem to see,
She is so pretty,
Shes so great.
She can have anyone,
Even those she hates.
Shes my best friend,
I love her to death,
Why is she jealous?
She can have anyone,
With every little breath.
She gets mad,
So easily she does,
When she finds love,
She turns and runs.
Why is she jealous?
Why is she mad?
She can have anyone.
Including the ones
Shes already had.