i play for keeps - If you play for keeps, you don’t need anyone, you’re the bes

If you play for keeps, you don’t need anyone, you’re the best and you know it.

I don’t need no one. I play for keeps and I’m the best.

She asked me to settle down. I said no, I play for keeps and I don’t need her.

He tried to ask me out. I said no, I play for keeps and I’m already with my marbles.