A few things to address

I have always been jealous of your closeness. No one else seems to come any closer. I always wanted that. I always wanted a friend like that.
But I do have that best girl friend, my sister.
And my best guy friend, my brother.
And I give myself to love more than most.

I have no reason to be jealous. I have that closeness of friendship. Although blood ties, I think that only makes it stronger, not less valid.
And you don't have that closeness in love. You can't have it when you have secrets and lies. You can think you have it. Thinking about possessing it and actually possessing it are very different.

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I would never draw you a picture
of my mind's fantasies
Though some entertain and others protect
none are real

I would never lead you to believe
in my silly stories
Though some seem vibrant and loving
they're all lies

I give you my heart and I give you the truth
You deserve that kind of love
You deserve everything