Don't Hurt Yourself Lyrics Meaning

I think there is a dual meaning here. On one end, she's saying that mistreatment he inflicts on her ultimately hurts him, because she will leave him. But on the other, it's almost an angry statement of unity. She's saying, yo we're married, and in our commitment, we became one. I am you and you are me. If you hurt me, you're hurting you too. If you play me, you're playing yourself too. Because you committed to being one with me.